Bill Hooks wrote:Or is there a chance that, say, the goblins could tie up the warrior while the ogre bears down on the hapless rogue?
I'd strongly suggest this if you want the players to take you seriously. Opponents should be reasonably intelligent, and keen to survive. Attacked by wolves - they'll probably pick off weak stragglers. Attacked by spiders - opt for a surprise attack, ambushing the last member of the party. Attacked by an ogre and a couple of goblins - if the goblins have missile weapons they can keep the warrior busy, or pick off spellcasters, while the ogre thins down the numbers and takes the conflict to the party. Challenge the party, but don't try to win.
Use imagination to track, or miniatures, coins, poker chips, or Post-It notes. Don't bog the game down in measurements or wargaming precision - just use the tools to keep the battlelines clear and manageable.