DMs get to play all the time, but not with their own player characters. I couldn't list, nor do I remember all the characters I created for D&D and then not played them. There were many.
I always enjoy creating NPCs, minor or major. So, why worry about my own PC when I create whole worlds and each of their inhabitants, and travellers.
Well, concentrating on playing just one character can be a challenge, and rewarding, too. Acting on stage in theatre I find playing one role relaxing, while as a DM running a 'whole world' can be a little taxing at times.
I'd like to play in a few one-shot games in the future. Especially with Fate Accelerated - for which I created a few characters already.