I still love BiaB. Granted, I at most do 5.5 gallon batches. However, I never fail to enjoy it. It is maybe a little messier than using a sparge tun, but it isn't that bad so long as you don't mess something up (have a large mixing bowl to rest the grain bag in once you pull it out is my biggest tip for you). Granted, bad back or not very strong, it is a pain to hold up maybe 15-18lbs of grain (weight when wet) for a couple of minutes to let it drain, but it ain't that bad in general. Especially if all you are making is small batches that would go in a 10L fermenter. You'll probably only be using 6-9lbs of grain.
Only time I cursed BiaB is when I made my recent 4 gallon batch of RIS. It was 16.5lbs of grain and didn't really fit in my 6 gallon pot well (I had to use my 6 gallon and then a dunk in my 5 gallon, both were filled to the brim, combined it just barely was 4.25G of liquid and boiled down to 4). With the wort in the grains, it was probably close to 30lbs I was trying to hoist and hold on to for a couple of minutes to drain. My back and arms were screaming after that.
A more typical 7-12lbs of grain is nothing in comparison.