2 days is plenty to do a lot!
I did a solo day at the parks this past July (and on Bastille Day mind you) and I did almost all the rides between DLP and WDS. Only ones I didn't do were spinners, carousel, and TSL rides. Avengers Campus wasn't open then, so that probably helped with my planning.
I only got a Premiere Pass for BTMR since it had like an hour+ wait and didn't really feel like waiting that long. Return time was instant upon purchasing. Also got a reservation for Mickey and the Magician show, which was so worth it.
WDS becomes very empty in its last hour or two, hence I was able to do their unique ToT like 6 times back to back within a short span. Not sure how this plays now with Avengers Campus however.
Waits across the parks weren't that bad at all despite the holiday. I thought I was gonna have to get the Premiere Access Ultimate, but didn't had to at all. The only thing that really felt crowded and a mess was the fireworks at the end of the day. Main Street was a mess and there wasn't any crowd control happening at the time, so hopefully things changed since then.
After all that, I took the train back to Paris then Uber to my hotel. It was very exhausting, especially since I landed in Paris that early morning and was jet-lagged, but that's what happens when you park hop like 7+ times in a single day lol.