I run a group between 5-7 players right now, and anything over 5 players is starting to get a bit sticky...I feel bad when we have "town" encounters when people are trying to roleplay their characters as they bargain and haggle, or help the needy, or something or another...it just doesn't o justice when each player only get about 30 seconds (or more) before I move onto the next...and they wait like five six minutes before they can "act" again...
Anyhow, for the larger battles, I do my best to describe in detail all the combat action...from lopping off limbs, to critically liquifying opponents, to splattering brain fluids onto their friends, to the bashing and tinking of armor hits, or arms or legs or heads landing in front of them. I think it helps just a little....
But what I also did was increase the amount of minions per battle. My players 'love' minions (we have 3 dragonborn) and they LOVE to be able to use their abilities to rip apart the small beasts. It makes them feel as if their charaters are powerful, and our tanks are now actually starting to tank, by taking an unreal amount of hits from these small guys. Cleave comes into play, the Dire Wolverine Strike of the Ranger, Scorching Blast, etc. all comes into play allowing the party to feel "useful" and "powerful" during the battles. Mind you, the encounters are filled with several larger brutes, or skirmishers, or artillery type mobs...and I think the party is having fun chasing down the small guys, getting mobbed by large groups of kobolds, and even getting totally immobilized by glue shots (they ABSOLUTELY hate it!). Minions, especially kobold minions are quite nasty...they toss javelins and almost never directly charge the PCs right off the bat. Their "minor action" shift really allows them to get into flanks and beat down on the players. A Slyblade lurker sneaking up behind the mages was awesome...then using his teammates as a shield to absorb melee and ranged attacks made the players look twice (to the point where one kobol minion shifted AWAY from the slyblade so he wouldn't be used as a shield!).
They're having fun, as they are dropping the baddies en mass, while feeling challenged. Each character has been critical to each battle so far, using their abilities to maximize their fighting efficiency as a team. They are starting to learn their powers and their roles, which I think, makes them more happy each battle...
Although, they just ran the gauntlet in a highly modified version of the DMG Kobold adventure, and are about to face the White Dragon with his pet drakes...this is going to be interesting (with most dailies burned, and the group has lost a lot of healing surges)...hehe.
The humor of it all....the party was HIRED by a group of kobolds, wishing to clear out the opposing clan, and potentially becoming the servants of the dragon, but they are also testing to dragon...as they are just as ready to become allied with the dragonborn.
Fox