At a big company you are given a slice and you really have to push to get anything more. I've had the experience where no work is assigned because approving anything takes time and once the work comes it is extremely easy to finish immediately because you have sat through weeks of meetings reexplaining everything to different groups get approval to change a form.
At one startup by the end of the day I was already learning four different languages/tools.
Now I imagine places like fangs would be amazing places to learn. If you ever work in healthcare most of your day will be explaining why this is a small change / very safe and you learn very little.