I planned to from the start as I read that overall you get more sleep and that it helps with breast feeding. It worked well for us. I was very rarely tired. Dd is now 12m and goes down in her cot in own room but comes into us around 2-4 when she wakes hungry. I'm too sleepy (lazy?!) to settle her back in cot, much easier to take to ours, latch on and both go back to sleep. I'm confident she will one day sleep all night in her own bed, but for now this works for us.
I personally think it is quite common and it would be better if people talked about it more. Lots of people seen to feel like they are doing something wrong if they cosleep. But it can easily be made safe and the sleep benefits are good IMO. Yes you get disturbed more often but you are in tune with baby so it is a gentle awakening not the baby screaming in another room shock bolt upright thing. Research has shown you get more sleep overall.