All color filters can be replicated in photoshop very easily, and it's way more convenient than screwing on/off filters. Color filters are remnants from the film era IMO, if you're shooting digital then you're wasting your time.

Also, stacking filters can introduce ghosting and flare. If you're using a UV filter for "protection" then you're not aware of how hard and scratch resistant modern lens glass is. Keep your lens caps on when the lenses aren't in use and don't worry about it.

All that being said, opinions vary around here. Someone's gonna chime in and say I'm wrong.