There are many "sparks" that occur right after surgery that I was told are the result of nerves re-connecting. These are your first really weird feelings of things inside of you. Over time, these go away.
The MTF surgery doesn't "cut it off", rather the nerves are re-routed and the skin used to fashion other things.
I never experienced this feeling myself. I will say, however, that I have experienced many other wonderful sensations from all over my wonderful womanly body at odd times if I'm touched or brush myself. I'm not talking about being touched sexually, rather just brushing against things or other accidental touching that's extremely stimulating.
Darn, women have a ton of receptors all over. It drives me crazy at times.