Haven't seen this issue in any of the Macbook (Pro) laptops I have used at work or my own. On my MBP, I have invested in a keyboard cover instead of a microfiber cover. It helps keep the keyboard clean and avoids any major wear while I type. I did the same for my old iBook before I got rid of it and after 4 years the keyboard still looked like the day I bought it.
And as far as I can see, the screen does not hit the keyboard even with the cover.
I bought my MBP cover from
Macessity, if you want to check it out. Worth every penny.