I've used Turbo Tax year after year - so I'm used to it, and that's a factor, but: I'm still using it because (1) it's well-organized (2) easy to move around in it and (3) it gets smoother each year. There's a lot to be said for using the same tool each year, but regardless - clearly TT is paying attention to what humans need and how (most) humans brains work.
We have used Turbo Tax for the past ten or so years. Takes away any worries of human error and Turbo Tax has our back should any questions arise about how they were completed.