I always use filtersAccording to MrFotoFool, you and I (and anyone else who uses filters) are just "snapshooters" and are not "serious photographers"
Or maybe we're just clumsy...
Just the other day I was out taking some snapshots with my 1D X and EF 600mm f/4L IS II and I didn't have a UV filter on the front of the lens.
In fact, here's the snapshot to prove it!
If they made them for Big Tele's, I'd probably buy one to be honest.