I use build cheats a lot (so bb.ignoregameplayunlocksentitlement, bb.showhiddenobjects, bb.enablefreebuild and of course bb.moveobjects)
I'm not a consistent builder, but I have a lot more fun making houses when I'm not limited to the grid.
I use cas.fulleditmode for my freshly spawned townies so I could have sims that don't look so similar to one another with the generic "townie" face templates and all that. I've been playing the same save since launch, so I know all my townies by name and by their face, and I wanna keep it that way.
When I play, I use sims.fill_all_commodities on my packed households sometimes, because whenever I enter a household everyone wants to pee or something. I use money cheats to take away money since I always end up making too much too.
For screenshots I use headlineeffects off to rid the plumbob off my sims.
I think those are just the ones I use. That aside I play ts4 like normal I guess.
My mods have their own use as well, but they're mostly to fix things like the overpowering "happy" buff or weird vampire wannabe/weird rain attire walkbys.