If they are not starved they will not touch plants.
Fcourse that if you have 1000 of them in 30G they will eat plants simply because there is not nuff food to go around.
People don't eat people but if you stick 1000 of them in 1 house with no food at all and no ways to get food in the end people will eat people. It is a very basic concept. With no food available you eat what you can.
So unless the OP does not have a serious infestation there is nothing to get all scared about.
Again, i have 3 tanks now, used to have 4. From 92G to a 3g, all with snails, all kinds of snails and i have NEVER had any problems.
"Perhaps some of you folks have no bad luck with your snails" you can't just make a statement like that.
It's like saying some bears eat meat some don't. They either all do or don't (under normal conditions).
Again, if forced anything will eat anything, heck i'd eat worms or cats if i had to survive but only if i had no other choice.
If the tank is seriously infested with them you have a problem, if not you just blame the first fool that comes to mind and that is usually snails.
Most people who cry over plants being eaten by snails have very low tech ferts/lights and such plants are not healthy, lot's of them die and snails snack on the dead parts of the plant. They then see bad looking plants with parts missing and they have an epiphany! Snails eat plants! OMG where do we run now!
Ask someone who has a seriously cared for tank with healthy plants and snails and they will tell you they have no snail problems at all. Ask some new guy in the hobby(who is yet unfamiliar with the whole plants, nutrients, etc) and he will instantly blame the snails for all the problems in the tank.
I also read as many "snail eat my fish" or "killer snails got my fish" posts as you claim to have seen about snails eating plants. Answer was the same, fish was dead, snail took a snack from the dead body of the fish.
In any case the simple solutions are 2:
assassin snails(cheap, perfect for the job and nice to look at) OR snail traps and i would use fish food in those traps or spirulina tabs. Both fish food and spirulina are more tempting than veggies and will catch more snails than veggies.