I'm not, I'm a double tap kind of guy. I'll press the skill about 0.5 seconds before it's back up, just to queue it up, then will press it again when it comes off CD. Really, the second tap isn't necessary so long as the ability queuing works, but it doesn't always work so I've kind of just gotten used to double tapping to ensure I get the optimal timing of the queued skill while alleviating any queue issues with a timed press anyway.

I know a fair few people are button mashers though.

Heck, I used to raid with this guy who'd be playing the simplest class in the game that would spam literally 1 button for 90% of the optimal rotation and it was hilarious whenever he'd talk on Vent, since you'd just hear him tap-tap-tap-tap-tap-tapping away in the background.

Also, when you'd see him stop casting his spell during a raid and then he'd yell in vent "GUYS, MY NUMBER 2 KEY IS BROKEN!" xD