What is the purpose of a window well for a window that is above grade?
If you were in a really dry region, it might be overkill, but window wells and covers also help protect basement windows from physical damage (stuff the mower throws, ornery pets, etc). 

That said, two inches isn't terribly much, and installing them would probably be prudent if you planned to raise the grade around the window with flower beds or something.

I'm pretty sure you're wondering if installing them on your home would also be a good idea. If you've never had a problem, then you probably won't. It's worth asking your neighbor about, if they were installed as a requirement for a home inspection, it'd be nice to know.