I realize OP has probably already completed their trip, but in case anyone has a similar question, I can report based on our experience last week (March 10-12).
The only attractions that my family used individual Premier Access for were Crush’s Coaster (the day before it went down for refurbishment) and Spider-Man W.E.B. Adventure. The one person who did roller coasters used the single rider line, which was quick. For non-coasters, our longest wait was 20 minutes for Buzz Lightyear (and 30 minutes for a second ride on Spider-Man). Most waits were 10 minutes or less early in the day and late afternoon. To be fair, it did rain a lot those days, which may have thinned out the crowds.
If you don’t need to do everything, you could easily hit the highlights of both parks in 1 day, but you would miss many of the shows.