I certainly used to think so. I had an RGB strip inside my PC case, one on the back of my desk, as well as a full RGB keyboard and mouse. I'm now pretty much officially past that phase. My mouse has no lights, my keyboard just has a white backlight, I just have a normal desk lamp, and the stip inside my case has been disconnected.
I still think RGB can look pretty sick in certain setups, but I personally prefer a more clean look nowadays.