Not only do I have a computer at my workbench but I find it indispensable. Great for reference photos, drawings, diagrams, YouTube etc.
There is also the entertainment side of it while you work, Internet radio, Netflix, Amazon, Hulu, et al, DVD's.
It can most definitely be distracting and I frequently have to turn it off.
Personally I would not be comfortable with a tablet, just to small for my aging eyes.
You don't need much of a computer for doing any of the above. An older PC running XP with 2 gig and basic on board video would work great. Just about any LCD TV made in the last 6-7 years can do double duty as a monitor.