I think some people need solitude, and I'll guess that people posting here tend to want/need solitude more than others. Others thrive on people contact and activity (the constant TV watchers, the ones following others around). In a committed co-located relationship, the amount of solitude and togetherness has to be negotiated.
This is an issue DW and I will need to address. We're perfectly content to sit in the living room, doing our own things but knowing that each of us is accessible for a question or comment or reaction. We do pursue "us" hobbies and activities with sets of friends that do overlap; this includes spending time with DD/DSiL/DGDs. But DW likes to -- umm -- spread out. There's not a wall in this house that does not have something hanging on it (not my preference at all). DW is a bit of a dervish when she comes home from work -- shoes here, her mail there, a glass of water the other place. Right now she is out of the house long enough for me to combat the disorder to my satisfaction. She kind of pokes at my preference for putting things in the same location (or even putting them back where they came from). It's an adaptive mechanism for me; it's not how she operates at all.
I'm not sure what kind of adaptation will be needed when she's home 7 days out of 7. It's something we'll need to discuss. I'll no doubt lose some of my househusband duties (that's fine with me) and she'll pick up on some interests which have been fallow while she's been out of the house 50-60 hours a week, working. One thing I'm sure will not need adaptation is the need for each of us to have some alone time. The negotiation will come in how we achieve it when we're both home most of the time. It might even lead to one or both of us being out of the house for a time each week. We'll find out...