^ Yeah, 2-3 AP classes a semester is no joke. They're genuinely hard work classes. It's worth it, though, but it's hard.
One thing that annoys me to no end (even though it's been 20 years now), is that many high schools counted AP classes as a max of 5.0 on a 4.0 GPA scale. My high school only counted it as a 4.0, so at least within the high school system, the extra work didn't count for squat over someone else in the main track courses.
My high school was already on a 5.0 scale, and AP classes could count as a 6.1 (for some reason). It was weird, and colleges got confused when they looked at my transcripts and saw that I graduated high school with a GPA of 4.9 (considering my senior year I stopped giving a shit and there were several Cs included in that GPA).
Well, that's just confusing.