Short answer- The gun will be fine as long as you don't make a habit of shooting +P+. As long as you've got a good gun and not something like a Hi-Point.
+P+ is hard to find and expensive. Most of it comes in those little 20 or 25 packs of rounds that cost $1 a pop. If you shoot 500 rounds of it you burned enough ammo to buy a new gun.
I find +P HP's to be more than adequate to meet my needs. I agree, as a fan of the 9mm I find the "you need a bigger gun" thing kinda annoying.......sure, I could carry a .45, or a .44 Magnum......but I like 9mm and so I think +P is fine for me and my CZ85b.
Think of it this way, many gun makers use the same frame as their 9mm to make their .40 pistols, like a Glock 22 .40 is the same frame as the 17 9mm. If the frame and slide can take tens of thousands of rounds of .40 than it can "handle" 9mm +P+.
There is a big difference in the +P+ ammo, for example back in the 90's a bunch of the Hirtenberger +P+ 9mm made for SMG's like the MP5 came in, and people were breaking their pistols with it because the stuff was super hot.....