Sometimes I do but it means the first thing I'll end up doing is spending the whole day in build mode instead of playing. If I plan on playing right out of the gate then it's better for me to start a new save using premades or my own Library/Gallery sims and move into a starter. This way I can focus on playing the game before getting distracted. Also prevents my other saves from being ruined by any new bugs/problems the latest pack is likely to cause.
I do have plans for the small 20x20 lot in Del Sol Valley turning it into a mini water park but I'd have to see how much of it will fit on such a tiny lot. Good thing I can probably build that lot in an hour or so. No need to work on it now.