1. Since I cannot send my AAVE, Band, Polygon, etc to Trezor what other hardware wallet should I look into? Should I go with the ledger wallet? I really don't want to, lol
I would not waste my time with bunch of those coins but both Trezor and Ledger are supporting erc20 tokens like Aave and you can probably connect hardware wallets with Metamask and store this tokens there.
2. Is there a way on Trezor's user interface you where you can see all the coins you've transferred there WITHOUT going into separate wallets? Since I'm hodling, my fear is forgetting about some of my coins (I know that sounds kinda irresponsible).
Using Trezor Suite with your hardware wallet you will see all coins you own in your account and you can have multiple accounts created and you do need to enable coins in settings.
Best way is to keep separate portfolio app and reduce the number of coins you hold.
3. Why is it that google gives you a list of the 1600 coins, but you can't see most of them on Trezor's actual site?? On the site, you can only see about 16 coins listed; If anywhere they should be listed there. The site doesnt even have a way to search for other coins...
Most of those 1600+ coins are erc20 tokens, and you can easily search all supported coins on their website, and similar thing is for ledger hardware wallet:
https://trezor.io/coins/https://www.ledger.com/supported-crypto-assets