DV did the same thing last year that Taos is doing this year. They pulled out of the Ikon Base Pass, but dropped reservations. It will be interesting to see if they backtrack the way DV did.
Alta is the most unusual scenario. They are only on the full pass and base plus, and do not require lift reservations. However, they do require parking reservations Friday-Sunday and holidays, and charge Ikoners 25 dollars for it. If you take the bus or go on a non-holiday Monday-Thursday, then there are no strings attached.
No new reservation requirements in the Northeast. Windham and Loon require them, but the others don't. As a Killington passholder, I know some were clamoring for Killington to require reservations, and are disappointed that they didn't. Sunday River and Sugarloaf also didn't go the reservation route despite getting spillover on days that Loon ran out of reservations.
I think Ikon got a lot of spillover this year from Vail Resorts underperforming so badly in 2021-2022. I would think that with Vail having improved at some resorts, and with the large price hike, that some will be back to Epic next year. Their pass comes at a lower cost and has fewer restrictions, but you will have to potentially deal with more crowding, and nickel and diming schemes like paid parking.