I do just that meriad, wash & dry, put on a tray so they don't all stick together, and once frozen put into bags.
They're 'almost' the same as using fresh
I kind of prefer chopping one or two at a time, as I need them, to doing the whole lot but have done that too - I use my mini-chopper, add a little oil, and freeze in a silicone ice cube tray. Then as before, pop out and into bags
I also do that with bought jars of pesto
Just read Debih's link - they do survive better when they're frozen on a tray first, although a bit on the wet side.