As usual I fall between two answers.

Yes I see a use for it, but as yet I have not needed such use.

"my personal experience is that despite greater opportunity then ever before, I print less than ever."

That's my experience, too. I rarely print anything these days. I scan quite a few documents into my PC, and transfer to my iPad/laptop but the printer just sits there, largely unused.

I've got a Kodak printer that advertises itself as e-print capable, but I've never got it to work.

Mind you, it took a long time to coax it to work on my home wifi network, so throwing data at it from the cloud is probably just asking for trouble.

It would be nice to have this facility though, as I regularly work from home, and whilst connected to the work VPN I cannot see any devices on my home network, so it would be good to be able to use Google E-Print even though I'm in the same room as my printer. As it is I have to email the document to myself and pick it up on my personal laptop for printing - god alone knows how many company rules that little trick breaks.

Ironically, whilst connected to the work VPN I can print to any printer connected to any Honeywell network anywhere in the world (in excess of 15,000 printers available when I just checked), but I can't print to the one in the same room...

"Even boarding cards can be done on an app, now" - if the airport accepts them and not all do.

I use Epson iPrint which works well both on the iPad and on my Android phone.

Does mobile include tablet/iPad app?