On a constructive note, the combats definitely are more interesting for players and monsters (at least during 1st level), everyone has options and the party really have to work together as a team to survive the tougher fights.
When running 4th ed, to help with marking, quarrying and cursing, i'd get some coloured paper clips and bend them into circular-ish shapes to throw over monsters when they get afflicted with any of those conditions, bloodied markers are quite handy to, for players and monsters alike.
Creating a combat encounter is a lot easier as well, as you just add up the xp value of the monsters you are chucking into the fight and away you go.
The DMG is a well written guide to new dms and quite a nice reminder for experienced dms.
The Monster Manual is a bit limited fluff wise compared to 3e but it you will probably know the fluff associated with monsters by now.
Although all the classic monsters are not present in the MM its easier to whip up monsters or apply templates.
The options for your character are a little limited at the moment, but then again you don't have the plethora of splatbooks yet.
The system will take getting used to, much like any new system.
There are a few "quirks", many are mentioned on these boards.