I would say most kinds of work.
Even if you're just on teams discussions - a real keyboard is much more productive than messing around on a touchscreen. Same with just reading. Sometimes I read a forum thread on my phone and then when I get back to the real computer I'm surprised how little I read and how much it felt like.
The only thing where I don't see this being the case is creative work like drawing where a tablet is really perfect, much better than a wacom or something.