I just skimmed this but wanted to share our experience. Because of DD's reflux she slept on our chests until 4 months, and the only reason we stopped was because she wasn't sleeping as well and I kept getting plugged ducts. Then we transitioned her into the side-carred crib (which was our original intent, wanting to semi-cosleep) with shush-pat (took 2 nights of 2-3 hours of shush-pat and then after her first night feed she was fine in the crib) and she slept in there the whole night after that, with an extra feed for the first month or so. When we were traveling at Christmas when she was 13 months, she was sleeping in a peapod on the floor and it wasn't comfortable for her so she'd wake at midnight and we brought her in bed with us and loved it, short-term.
I love waking up with her in the bed.
She's still (15 mo) in the crib right next to the bed, though we've had the rail up since she started crawling at 6 mo. It's made night time disruptions like teething SO much easier because I can keep lying down but just stick my hand through the slats and pat her, etc.
We plan to do the same with LO #2 in September though hopefully without the 4 months of reflux.