If you really want to protect your server, i suggest using: core protect (Lets staff fix griefing, in most cases), LWC (Modify it to protect every modded block that should be protected), Towny (Which you need to HEAVILY modify) Or MyTown, which was built for forge (I use towny, simply because it is awesome), Essentials (Maybe, this is more for the players then the staff), world guard (To ban/blacklist ban items & protect spawn) along with itemrestrict to ban/limit bad items (It is always nice to have a back-up banned items list).
Griefprevention (Or golden shovel) is very buggy and/or not as stable as MyTown or Towny. My opinion on it is a lot of people use it because it is fast and easy to set up, yet offers almost no protection and no real value to the server. Although im sure you can modify it, i suggest not using this, ever.
And lockette imho, is just a pain in the ass. Signs get in the way a lot, and locking everything like a smeltery or a ME system would be horrible.