I fly helicopters for my livelihood and light aeroplanes for my recreation and after more than 40 years since I started, I still have slight "butterflies in the stomach".
Nice to hear that. I'm a fixed wing intruder (bored Friday afternoon) but I wondered if that slight, not nervousness but heightened awareness would go away. If you still have it as a pro after 40 years then I don't feel so bad about getting that 'Phoo, are we ready to go, yep, let's do it then' feeling I still get before I open the throttle.