What do you use the most?

I am the same way. I use every penny that I have spent on this game...even if the EP is buggy.

I love the New Age radio station, Baroque station and The Focus radio stations when my sims are writing books, cooking, painting or even performing repairs on a lot.

My most used feature is actually a piece of cc, Littlebowbub's medieval cookbook with a hunting/foraging extension.

At the moment horses and lightsabers are my most-used non cc features, with many families owning either or both, even when they aren't Jedi or participating in races. It's part of the lifestyle of Black Spire Valley, something to make the neighborhood feel part of the same culture, despite the characters being very different from humble giant crop growers to ambitious politicians.

Gardening and pools (whether at home or visting the public one) are also always present in my saves.