Definitely in the 'great cloud of witnesses' and 'communion of saints. They spend their time praising God and worshipping the Lamb who was slain, not looking down 'through the holes in heaven's floor'.
They “spend their time”? Really? What “time” would this be, and how would they know if it is being “spent”, or not?
There is so much we can’t even imagine, let alone comprehend, about living in eternity with God. We have no point of reference for it, being so thoroughly confined by time in our present lives. So much so that our language is inadequate to describe it. Is dwelling in eternity simply having endless time? I don’t think so, personally. I believe it must be much, much more than that, though I can’t envision how, exactly. How will additional dimensions be experienced?
One thing is sure, though - we won’t know what it’s like until we’re in it. :)