At DL, the hard to get FPs have not changed much over the last 10 years. Not sure when you were there last, but here is your list:
- Most in demand FPs at DL:
Space Mtn
Indy
Star Tours
Splash Mtn (when it is warm out)
I try to time the Splash FP for the afternoon.
- Easier to get FP
BTMRR
BLAB (always easy as it sounds like it is still not connected)
HM (except during HMH)
RR
My strategy at DL is usually to start with Space Mtn, then Indy. I usually do not start getting FPs right away (because the return windows are so early and not that crowded yet when you use the FP). I instead focus on rides and start getting FPs 30-60 minutes after the park opens.
BTMRR usually has plentiful FP with return windows within an hour all the way into the evening.
- Most in demand FPs at DCA
Top tier...
RSR (far and away the most popular and gone withing 2-3 hours after park opening)
Soarin (this is not historically that in demand but as a PP stated it will be after June 17 when the new Soarin movie shows)
Next tier...
GRR (On a warm day)
ToT
- Easier to get
CA Screamin (like BTMRR CS usually has plentiful FP with return windows within an hour all the way into the evening - except be careful as it closes early for WOC)
GSS
There are also FPs for shows that work independently from the rides.
Be aware that there are rumors DLR is getting FP+ in the relatively near future. I suspect it may be after summer ends.