I don't think I'd be able to play the game without my cc and handful of mods. The UI cheats extension mod is a big one for me... I use it all the time to fill my sim's needs when they're in the middle of something that can't be interrupted to go pee or take a shower. Their needs drop so fast throughout the day that it's virtually impossible to get anything else done. Plus the handful of mods I use to fix various bugs that EA has been ignoring for months.
But most importantly is various cc items that I just couldn't live without.
Truth be told, if it weren't for mod/cc creators over the years, I really don't think this game would be as popular as it is?