I know this may be a stupid question, but I never really played vanilla so I have no idea about anything.

Will it be more efficient leveling 2 separate teams of 2 or 3, then to level a single team of 5 at once? It probably isn't, but how much more tedious do you think this plan would be?

An example would be to level say a Paladin and Warrior to level 20, maybe 30, and then level 3 mages to level 20-30, only to join them up later to make a 5 man dungeon team.

My personal reasoning would be that I find it easier and more fun running small teams of 2 or 3, so I can quest easily and not worry about lugging a whole team around in the lower levels, and then 5 box when the content gets harder.

We are starting from scratch, so I will have to set up add ons, keybinds, macros etc. The early level zones population is probably gonna be insane, so gather quests would be much easier this way too.