I did use plastic pants for 6+ months with first baby, but found the polyester wraps much better/nicer. The plastic pants just ripped to shreds after a few months use, were quite stiff, cut into legs, etc.
SunshinePine -- what wrap (pants) do you use on your 7yo? I started a thread on here years ago about using cloth on children at night, and nobody else seemed to be doing it. I felt quite the weirdo at the time.
We use old bath towels I got off Freecycle for 4yoDS's night terries. He's been fine in daytime for over 2 years, just havent cracked nights. We used some Ellas house and other shaped nappies for DD when she was still in cloth at age 5yo, but she hardly wet them. DS4yo really NEEDS a big cloth nappy at night. He looks pretty silly wearing it, I must admit. And we get leaks, but we get leaks with his nighttime disps, too, so can't win.
We have a Rebus XXL wrap for his night nappies, (we only needed a Motherease XL for DD when she was 5yo, but she was quite petite). We have disps too in case the wrap is in the wash (or otherwise un-locatable). They're partly the old style Moltex Oko disps, at least.
We still use terries for DS (9months) night nappies, with a prefold as the booster. I guess I am lucky someone gave me a lot of shaped nappies which is what I usually use in daytime, they are a bit quicker/easier/less stressful to put on than terries.