What Disney charges for Monorail resorts is really steep for most people. With 5 adults, we need two rooms which doubles the cost, so again worth is relative.
We have been fortunate to stay at the GF. My wife liked it a lot. The service was incredible from the greeter at the front door to the bellmen, valets, housekeepers, etc. Even better than those same positions at the CR or Poly. Our second floor room had a view of the monorail as it came around the back o the resort, so it was actually quite nice.
If you would rather have a nice view of the Castle and the fireworks, I would suggest a upper floor park view room at the CR. Plus you can walk to the MK. The service there is close to that at the GF. We've stayed there more than any other resort.
Not to leave out the Poly. Can't say a bad thing about it. Well, I wish they had not destroyed the original lobby, but what's done is done. Launch service to the MK is a great perk. Capt'n Cook's is, in my opinion, the best quick serve on the monorail. Have not been there in about 10 years, so I can't speak for the room conditions, but it is a great place to relax if like spending time at the pool or the beach.
All the hotels have their own special vibe. Visit each for an hour or two and check them out.