Seems like a lot of issues but none seem like they should be that hard to get the dealer to fix.
One thing I learned from my 2010 Equinox was to never buy the first model year of a vehicle. I loved just about everything about it but it needed a lot of work for a newer car - all under warranty, without too much fuss, and nothing that really inconvenienced me too much.
Not sure if the Traverse first came out in 2009 but I think it did. Anyway, it seems like the first year or two of both the Equinox and Traverse have a LOT more problems than the newer ones. Unfortunately that doesn't help you much and I can see why it's turned you off of getting another GM vehicle. It's not like you bought a base Cobalt, I'm guessing that LTZ cost you a decent amount. I guess your one consolation at this point is that GM lost money on your car.
Anyway, welcome to the forum!