That sounds like me pallyndrome. I love alot of sims, keeps it from getting boring and yes, pause is a wonderful thing. When I was doing crazy eights, it did drive me crazy using one sim, Wishmasters is pretty good so far, but I do like 4 or more sims in a household.
Usually when I have that many sims I have some at home doing various jobs. I have not been brave enough since Ambitions came out, to play more than 4 sims with any of the new careers or professions, but like was stated in earlier posts, you can have a couple of sims do the original rabbithole jobs and then a couple of sculptors or inventors and maybe throw in a PI or Stylist in the mix. I am such a glutton for punishment, but, they do manage to all stay in the green.