After being away from the game for awhile and hopping back into it, I must say that I'm really not a big fan anymore. What I appreciated the most about the game when I first started playing TF2 was that it was a very straightforward, slightly comical first-person-shooter. To me, the ridiculous amount of new items and weapons and stuff has changed the game into something different.
I do get where you are coming from. The amount of items is overkill (I think I have pretty much every weapon item for every class), but I just turn them into scraps and reclaimed.
I never really considered TF2 as a straight forward shooter, simply because there is no main game mode where simply killing eachother or having the most kills is the objective. You do try to kill eachother, but to accomplish a objective (stop the the opposing team from advancing, to cap a point, to defend the intel, etc.).
Never just to get the most kills. Yeah, I am one of those crazy players who recklessly, with disregard of their own life, try to stop or push the cart

When I just felt like shoot to kill, I played Killing Floor.
Still, I do like TF2 more than the average FPS. I like the style (bright, cartoony, comical), that all classes have a different game play and the versality in maps and game modes.
There are also some mods which can be fun once in a while (Balloon race, Wacky races, Prop hunt, dodgeball, Saxton Hale, zombie mode, etc.). So it keeps things a bit more fresh. But even I get tired of TF2 at times. But that is in part because I play the same servers, who often use the same maps.