I'd heard that GRR was reconnected; though it's news to me that RR is. Last I heard it was still unconnected.

Can anyone verify?
In CA, Soarin', Screamin and GRR are probably the most popular in that order. Followed closely by ToT.
In DL: If RR is indeed reconnected, I'd say it's not one of the top FPs. Those would be Space, Splash and Indy. Then I think I'd get BTMRR, Buzz and then RR. I'm leaving out Autopia because I've never been on it, nor have a desire to, partly because I've heard the FP line can be nearly as slow as the standby line-- and I spend enough time in traffic every day that I don't need to experience that as a ride!
RR is way back in Toontown, so it seems like it's not as busy or in demand as the other big rides. I mean, it still gets very busy on big days, but when I've heard of FPs actually running out by 2 p.m. as they do on a very high traffic day, it's only been for the top three that I listed, in each park. Oh, and I've seen ToT run out, too, on a VERY busy day.
Just thinking out loud, here. Hope that helps.
