Yeah as above - 2x 5-man teams running together.

IF your questing means you have to do most things twice but with the fact you also kill things 10x faster it balances out.

I'm not very efficient or strategic and I find I probably level at about 2/3 the pace of a solo player (but I'm doing 10x at the same time) so it's much faster to put up with the pain and caveats of grouping than trying it solo (you will burn out!).

Pick things up quests are painful, destroy this quest are painful but I find if you just get on with it at least it's not as bad as Classic - one kill drops one quest item, retail each toon in a group gets the loot so you only need 2 kills for one quest item in theory.

Personally I don't have a tag system - I simply have two leaders, I do the quest/kill/object on my main toon, then I swap to the secondary leader (normally about 30/40% of the objective is already done on the second team of 5x) and simply continue on him until complete.

Edit: Ignore me - just seen this is Classic and not Retail. GL and have fun, I got to level 18 before I decided it wasn't worth it