We will take advantage of FP+ and stay onsite on our next trip, and do Universal.
FP+ actually helps us do Universal. For us, it's just for Harry Potter, so we don't spend a whole day there. This next trip we will get a WDW ticket for length of stay, and also spend 3/4 of a day at Universal. One morning we'll have FP+ for one park, do the 3 rides, leave, and go spend the rest of the day at Universal. We may even do 2 days this way, in case we can't get Diagon Alley/Hogsmeade done right in one day.
For other days we'll continue to park hop, having our FP+ scheduled for the afternoon park. We may do some morning FP+ too, as we love World Showcase at night, and tend to hang there one or two nights to shop and dine.
We tend to go for 6-7 days, which gives us plenty of FP+. We do rope drop and EMH, so there's plenty of time for attractions. Hubby would rather have me spend time in a queue than in a gift shop anyways, LOL!