I too recently have this. I have been playing infrequently lately due to being very busy so I think it just started after I bought City Living. I opened up a save I hadn't played in a while and intended to move them to the new city. They were asleep so I got them up, had them take a vacation, and got them fed in preparation for the move. Once they had finished eating I had them WooHoo in the observatory one last time since they wouldn't be able to have one in an apartment and as soon as they finished that one of them went for the workbench. I went into build mode to pack up the things I wanted to bring with them to the new lot and after I exited build mode the other one went for the work bench. I canceled that and packed up the workbench and moved them to the arts district. Once I got them moved they each were taking turns at the work bench during the welcome wagon event and when they weren't at it the guests were making sculptures on it.
So far I haven't noticed them neglecting needs but with triple boost in effect their needs were decaying slowly. They also have the gaming mat from the tech guru career reward and they were just as happy to autonomously get on that as well. Basically if I leave them to their own devices they alternate between the gaming mat and the workbench.
