A couple of things:
If memory serves, pill bugs and roly-poly bugs are both different species of woodlice. I would be surprised if they were the ones directly responsible for eating the fresh foliage as they typically dine on decaying plant matter. That said, I can attest to the fact that they will move in on things after another critter (for me this is typically cutworms and slugs) have already had a go at them and opened them up.
To try and control them without pesticides I would recommend making sure that any mulch is pulled back away from your plants that are in the ground and echo the use of diatomaceous earth. It may also help to water in the early morning so that the area around the plants has time to dry before nightfall when the little buggers come out.
For potted plants or heavy infestation, if you are willing to spray, I would recommend the Bayer 3 in 1 insect, disease and mite control. You can use this as a spray specifically on infested plants, and for the potted ones, I would mix some up and use it as somewhat of a soil drench. I use it for spot treating daylilies that may come in with rust or get other pests but it does have the benefit of keeping the woodlice away, especially from foliage that is dying if should the plants go dormant in the summer.
