I have owned Honda products for almost 40 years. The only wheel alignment issues I've had (consistently) is a little too much front outer edge wear, which is not factory adjustable on these Hondas. I have never hit anything quite hard enough to change the alignment but that's not how it felt at the time. I wouldn't do a wheel alignment if the tires are wearing properly and the vehicle just "feels right", especially not for $180.00.
Improper toe-in or camber from an impact can cause excessive and sometimes rapid, severe wear on either the inner or outer edges of tire pairs. Either will likely affect the way a vehicle steers, sounds and feels. You may be able to see misalignment from impact by looking at the front wheels head-on from a distance.
I'm going to get into camber and toe-in. Other tire wear issues like scalloping and over- and under-inflation are covered on the web, and probably, here on OdyClub.
Years ago, I learned to check wheel alignment at home, but it's not for everyone. First, open the hood. Then check that the car is right-to-left level with a carpenters level. Use a shim under one wheel if necessary. My driveway is level in one area, so there's nothing much to do here, but I will still check the vehicle for level. The front wheels should be centered straight ahead, then drive the car a few feet straight ahead to remove any side loads on the wheels.
For the front toe-in, I use two eight foot lengths of 2 x 2 square aluminum beams, propped up securely against the front tires, maybe eight inches off the ground. I measure across these with a tape measure, near the tires and then near the ends, using a little math to convert the measured difference into inches of toe. I have used about 1/8" to 3/16" difference between the two measurements, which comes to slightly less than 1/16" toe-in. You will have to jack up the car to adjust the toe-in, so you have to re-park the car to check your adjustment.
A few years ago I bought a simple tool that reads camber directly, which makes this easier. You might want to note the difference in camber between the right side and the left side of the vehicle, because most roads are crowned, so the camber is different to offset the natural pull of crowned roads. Improper camber is indicated by outer edge wear on the front tires. Frequent slow speed turns and curvy roads will accentuate edge wear, as will low average tire pressures.
Front camber is adjustable with eccentric bolts (from rockauto.com). I have used a 2 foot level and shims to measure camber. A little trigonometry gives me the degrees of camber using a level. The camber tool is easier.
Rear camber becomes adjustable with aftermarket adjustable upper rear links (again, from rockauto.com). The inner edge on my Odyssey rear tires would wear a little too much because my Odyssey was almost always driven rear-heavy, resulting in too much negative camber for even rear tire wear. First, check the rear toe-in, because if you adjust the rear camber it will change the rear toe-in.
You might think that tire rotation would offset the inner and outer wear, and it will, if edge wear is normal and somewhat limited and pretty much even, compared side to side.
The tire wear pattern is what I have always used to determine if alignment is necessary. I have always been satisfied with the results after adjustments to correct edge wear. FYI, my 2016 Odyssey is the first Honda I've owned where the edge wear on the front tires is minimal and alignment seems almost perfect. What helps to reduce edge wear is adding an extra 5-6 psi of air pressure to all tires.
Note that the first few 32nds of rubber on a new tire will wear off faster than the last few 32nds on an old tire.
I have driven over 300,000k on Odysseys and on one Chrysler minivan. I will buy oversize replacement tires, for load capacity, impact resistance and longevity. In spite of what tire warranties offer, the mileage has always been less than the warranty mileage by maybe 25%, and this will vary from manufacturer to manufacturer and tire style to tire style. Putting 50k+ miles on a 70k tire is about right for me, but with some brands and tire models it could easily be less, or more. This will depend on a ton of other factors as well. I usually buy from Sam's Club or Costco because the road hazard warranty is double the rest of then tire stores, and tire service is available nationwide, as it is with Walmart. The prices have been good or better than from other tire sources. Tirerack.com is an excellent source for tire information, and their selection is superior. Tire manufacturers compare their tires to a "standard" tire with a mileage rating of 100, but there are no standards for what that tire is, so wear ratings are not directly comparable between manufacturers. How much remaining tread you can accept is another factor. Other tire wear issues are covered on the web.