Earlier quoted context omitted.
People are wedded to Excel because they've spent a lot of time learning it and don't want their skills to become obsolete. The resistance is rooted in psychological / political reasons, not technical ones.
I disagree. For users who aren't going to make the leap to "real" programming, spreadsheets are a huge boon. Excel is the only thing many domain experts can use to turn their knowledge into a computational model. Sure, there are tons of problems compared to models implemented in general-purpose programming languages, and we love to complain about the atrocities committed in Excel, but nobody's yet managed to devise a…
Excel is faster to get started. But for advanced tasks, the time it takes to learn Excel / R is about the same.
A big reason why people don't make the leap is because they already spent too much time becoming an Excel expert. Indeed, for young analysts with no baggage, a lot of people learn and use R instead.