Today's main lesson for me was in picking dynamics.
The new models respond even better to picking dynamics than I remember their Ultra counterparts. I spent a lot of time with the AC30 factory preset (just turned off the delay) so it was just amp/cab/reverb. The way the timbre changed with my picking dynamics was unbelievable. It was even more so when I switched to the Trainwreck preset.
From a feature standpoint, I started getting into the quick edit knobs. Very much easier than scrolling and only using the big (value) knob. Pushing the "perpendicular" navigation buttons (e.g., left/right when the actual scrolling is up/down) skips you five parameters, allowing you to page through in sets of five adjustable params. This makes fast work of getting through the amp geek parameters.