I'm in a minority! I use the rotary cutter almost exclusively to cut out although I have shears and snippy scissors if necessary. I find my hands seize up if I use scissors or shears too much and being left handed, find the rotary blade much more accurate even though I have left handed versions of all my scissors.
What
@Nevis5 and
@mudcat said! I'll take a rotary cutter any day of the week over scissors. They are extremely accurate if used correctly which BTW many people don't do. Cutting outside notches? That is so last Millennium. It's been over 30 years since I've done that. Just adds more fiddly work. Either a small snip in or pencil or chalk mark or my happy little Frixon pen. Weights or pins. I've never had anything weighted slip.
I think fear of messing up causes most of the problems people experience with rotary cutters. It's like learning to ride a bike. Pedal slowly and you'll wobble all over and have no control. Speed it up a bit and you have much more control. The RC is just another wheel so the same thing applies. I can usually freehand pattern cutting with the RC, even straight edges but use rulers where they make more sense.
It is so much faster to cut with a RC. Also I have Carpal Tunnel, over 30 years, and a sharp RC blade is much kinder to my hands than any scissors, including my spring loaded Fiskars.