well, I'm a doc; I and every other doc in the military use a ncurses-like system on a VT500-7 emulator hundreds of times a day because it's insanely fast compared to the slick java/IE7 GUI that the gubm'n't spent $20B to write (AHLTA, look it up. Tons of money for you if you can beat it. Would be willing to help).
Ahh, thanks! I was thinking of terminal usage as being synonymous with shell usage, when, of course, there are many users of character-mode apps that never see a shell.
An iPad running a terminal emulator and with a keyboard attached would be a comparable experience. Though, clearly, it's not the best solution for most such users. Linux/etc all the way for that.