Perhaps it is just me but I include "getting stuff done" as part of "work."

Perhaps it is just me but I find a smartphone incredibly useless for anything but the most passive of tasks.

If I want to "do something" I use a computer. "Something" being defined very loosely. Do rather than consume. Even doing something for leisure since 99% of "doing" tasks are very difficult to do on a phone for me - if that makes any sense.

I would agree with you, but the majority seems to be against us. Personally I find the usability on smartphones, and iPads, frustratingly poor. Even something like browsing the web is pretty much impossible, navigation is awkward, keyboard is rubbish and the speed is terrible. That being said I think there's only a few of us that forgo smart phones and tables for a laptop or even desktop PC.

Office workers however are most likely not going to swap out their PC in the foreseeable future, in terms of speed and usability their are still way ahead of any mobile device (laptops excluded of cause).

Yes, mobile is just as important, if not more, that PCs in some industries. If you do online commerce, entertainment and consumer facing services ignoring mobile would be foolish. For other industries you can safely ignore mobile for now.

I guess if you spend most of your time at a desk. But that sounds dreadful to me.

I'm not sure what you mean?

Lets say I want to book a hotel. On a laptop or desktop I can do a few searches extremely fast, open up a few tabs and switch between them almost instantly to compare. My "work" gets done extremely quickly I am very happy with the results. Well I once had to book a hotel in a bar on my phone. Dreadful experience if you want to do any sort of comparison shopping at all, and I have a pretty new phone.

Of course mobile is extremely excellent for some things but very bad for what I consider "getting something done." That's simply my personal experience though.