If I do Online check-in and arrive around 11am
I agree here. Having 5 adults in your party, it's good to have some space to move around. A standard room with 2 Adults and 2 teenagers, you can get away with spending time in the room to rest or sleep. But with 5 full grown adults? It's good to have some space so spread out. Although its basically 2 standard rooms, you have enough beds to be more comfortable.If you're thinking of staying in a suite, I think it would be a good move. You'd have 2 bathrooms and a lot of open space. And you would have a mini-kitchen with a microwave which comes in handy if you like to eat breakfast in the room or like to be able to heat up leftovers. It's also nice to have the separate bedroom so that if someone is on a different sleeping schedule or just needs more privacy, they can have it.
If you're thinking of getting a Little Mermaid standard room, then I'd suggest staying at Pop Century or ASMovies as those rooms have the fold-up bed where the LM rooms don't. Being able to fold up that bed during the day will provide you with more open space in the room.