No, I don't think you'll be disappointed at all, in fact you may like the "Radiance" class a little better. There won't be quite the number of activities, but there is a rock wall, no ice rink
Food, service and entertainment are great on both classes, cabins are layed out pretty much the same on both. I did love the pool deck better on the "Voyager" class, the Radiance pool and decks seemed way too small, and it was an effort to find a lounge chair in the late morning, especially on a sea day. You will find self leveling pool tables on Radiance close to the "chops" restaurant and another lounge. I thought the atrium on Radiance was exceptional, but I really love the atriums over the mall on Voyager.
You will also notice a big difference in the Windjammer Cafe, lots of different food stations, virtually no lines ever and they have double stations, one on each side, plus a drink station and coffee. You'll also find coffee and drink areas in various places, so if you are in search for just something to drink, you won't need to go all the way to the Windjammer for it.
Do let us know how you like this class, I like it better, but still would go on any Voyager class again too, in fact next cruise is on Voyager in Feb, did Radiance this last Feb, and the year before Explorer.