When they turned two I nightweaned. Then, when they had that concept down, I moved them into their own room a few months later. We put two mattresses on the floor next to each other, just like you did. Once we'd set up their new beds with their new sheets (that they picked out) they were so excited that they were not interested in sleeping in my bed anymore. I nursed them to sleep and when they were asleep in their beds, I snuck out. One woke up once that night and I went in to sleep between them.
They immediately slept better! DS would wake 3+ times per night in my bed even after nightweaning, but now he sleeps soundly. I think it helps him having more space.
6 months later, it's still common for one of them to wake up one time. I usually either go in and fix the problem (one's cold or someone has their feet in the other's face, etc) and then go back to my bed or else I lie down to calm the upset one, and it's just easier on me to go to sleep right there. My sleep is SO MUCH BETTER now, I'm feeling much more human and functional. Waking once every night or two and going to sleep 5 minutes later is not a big deal. It's comparable to having to get up to go to the bathroom once per night. I'm just not up as long. To make it easier on me, I have a spare pillow that I leave in between their pillows, so I don't have to carry one around at night or anything. I don't complain much about sleeping in there (about 4x/wk) because it is nice to get to cuddle with them still in the morning.