Hi Susanna,
I've been to the Grand Canyon twice, on two different JY tours. On the first trip, we went to the western rim (where the Skywalk is) and we did the helicopter/boat trip and although it was a good experience (my first in a helicopter), it was a little underwhelming. The chopper flight was over in seconds as we literally just flew from the rim to the bottom of the canyon and, after the boat trip, back up again. Again, the boat trip was fine but the views weren't what I thought they'd be. Back at the top of the rim, the views were pretty impressive but once again, I felt that the Grand Canyon wasn't quite the mind-blowing experience I had been expecting!
Two years later, I did the National Parks tour and we went to the southern rim. The contrast was incredible and completely blew me away! The scenery was staggering, much more colour, and we could see much further. I did a helicopter flight there and it was wonderful, so much better than the boat/chopper excursion at the western rim. So, to be honest, if you do a helicopter flight or plane trip I am sure you will have the experience of the Grand Canyon that you were hoping for.
Hope this helps!
Bob