Well, I've cruised RCI twice since these perks were in effect.
You'll notice these if you look hard for them, but no real difference to me and it has never effected my cruise in anyway.
The seats by the pool are empty for a few good reasons. One, not everybody wants to be known or seen seating in the areas that services suite guests only. Secondly, at the pool this section is up on a tier and if you want to be closer to the pool this area isn't the best. The same with the balcony seats in the theater. Some use it, but I've seen people complain that you can't see from certain seats because some of the columns are in the way. Most people come in early to get seats up in the middle front which happen to be open seating to all guests. These are the prized seats. If I were a suite guest I'd consider the balcony seats the crappy seats.
The seating in the buffet area is no big deal either. It's a separate area in a speciality restaurant. You can hardly see them in there anyways. They only use this perk mostly because it's easy to get a seat. Wouldn't you? We run around in circles looking for seats (like we do to find a seat in Topsiders/beach blanket) until a table opens up.
If these suite guests came with other friends that didn't have the perks than their friends couldn't sit in there with them. So, I'm sure it doesn't always work out.
Now the beach is a new thing and also the cabanas. Rumors are that one of the beaches are going to be for suites guest. Not sure what to think, but I've been to the island twice and never used that beach, so it really doesn't seem to bother me. I do have a feeling
DCL will do something similiar. Maybe two different sections.
Other than those few things I never noticed the difference between a suite guest and me standing side by side or dining side by side or taking the elevator or stairs.
The majority of guests on RCI do not wear their cards/KTTW around their necks like they do on DCL. This practice seems much bigger on DCL.
DCL does give out landyards that give away your member status.