Assuming 5-6 gallons, with two packs, you don't need to rehydrate. If you want to save and just use one pack, then yes I'd rehydrate.
No aeration required with dry yeast.
It just doesn't get any easier than sprinkling dry yeast and walkin' away.
I've never used the S-23 yet. Someday I'll probably try it. I know Denny dislikes it but that wouldn't necessarily stop me!
Maybe we like it.