This is all so fascinating to me--particularly because a) I didn't know ASP and DP were oustered before the seventh season and b) I've been doing a GG rewatch and just started watching the final season for the first time ever. I immediately noticed significantly different things--including new/different ways the camera is being used and unfamiliar/new locations (seriously, never thought I'd see Lorelai at a car dealership). Season seven isn't as bad as I'd thought it would be, although I am hopping mad at how Lane's storyline has played out. But it does, at times, feel like Bizarro GG.
I'm another defender of season 6. I kind of loved "the rift"--it gave viewers a glimpse into an alternate world where Rory and Lorelai weren't BFF, it gave us an idea of what life might have been like for Lorelai if she'd stayed under her parents' roof (via Rory's experience with Richard and Emily), and it changed the dynamic between Rory, Richard, and Emily in interesting ways. That said, I can't buy Luke and Lorelai's relationship this time around, and the only reason I can forgive The April Debacle is because April is played by little baby Bay Kennish from Switched at Birth and thus now comes with instant appeal (for me).