A lot or pros use to, and I assume still do not use filters. But lots of people are not today. The reason is that there can be image problems like flaring and ghosting.
I also seem to recall a test done some years hack that tested all the UV filters that people were using and found very few that really did a good job at blocking out UV rays. Hoya was one of the cheaper ones that did a great job in thier view.
But if you get and use one when shooting, make sure that you get one that is multi coasted. ITs coated 3 times on each side I read if it says Multi costed. Other wise its just coated once.
I know of a few people that would get a junk filter and keep in on the lens till it was time to shoot, and then took it off. they only used it for protection.
I remember when I use to work in a camera store about 20 years ago, maybe more than that. FIlters made you big money then. Not so much now with Photoshop and all that. But we use to sell tons of them. I still use them for B&W.
Just be sure that if you get a UV filter that you get what you pay for.