on horde I am pretty consistently in raid groups ranging in size from 10-30 people
on alliance they never form groups for the invasions.. I don't understand.

Because horde doesn't know groups are useless.

exp is the same. you know where everyone is. you have tank/healers. you can do more bosses instead of going straight to final boss on last phase.

I don't understand..

also getting mobs tagged.

yep that to. don't have to worry about not getting a hit on a mob to get exp for it
i feel like it takes so much longer to level my ally characters because no one groups. I feel like just afking

to me invasion is tag boss run 30 mile away get xp rince repeat dont really give a shit about grouping lol

Same for me

thing is you can group have them tag the mobs. get experience and don't do shit.

granted I typically tank/heal so groups are very beneficial for me.

You can just run around tagging mobs a single time and still get full XP from kill while solo, don't need to be in groups.

who needs groups XD all i do is afk an play on my main lol