i too can only speak from personal experiance but DD fed over night till 2 years old, and atleast three times a night till about 16 months. But it didnt bother me either. We got too a point where i was pregnant and wanted to get her sleeping through but by that time she was ready to stop and it was pretty easy, a few nights of asking for it 1000 times and now she sleeps thought fine! Friends often told me to give her water and i tried a few times but it just didnt cut it with her.
every child is different, i honestly think that DD wouldnt have been ready to stop before she did. And each parent is different, for your friends it might not have been right for them to be getting up to feed over night. If your happy to do it and you have reservations then i would listen to that inner mumma and carry on with the way your doing it!