The Pathbuilder App is pretty good. Sadly, not available on Apple Products.I feel that a lot of the prep issues could be greatly mitigated by having good software available. That's another advantage of 5E right now. Sure it's a lot simpler, but there's plenty of software out their that lets you offload a lot of the work. This I think really needs to be a priority for anyone who wants to keep D20 alive.
I was running 5e on Roll20 this weekend. I did a quick Google search, found a random encounter generator and then a random treasure generator. It was awesome to be able to come up with something on the fly.