I find a names list invaluable. The dungeon starters don't have any, and it's a place I struggle to improvise well with.
Names of people (common names, exotic names, potent names), names of places (towns, ruins, features), names of groups (churches, orders, cults, cabals, etc.). The more evocative the names, the better. I find a list of 6-12 of each much easier to use than anything like Abulafia.
Along the same lines: anything you know you're not great at improvising, look for resources to help. Not good at making interesting dungeon maps? Grab some Dungeon Geomorphs or some maps from Tony Dowler's website. Have trouble describing grand vistas or majestic buildings? Do some Google Image searching and assemble a library. Want a continental map but don't want to make it up? Go to the Cartographer's Guild website and find some that strike your fancy.
That's my opinion, anyhow.