WordPerfect had me stumble on the first step and never recovered
The first computer I owned was an Apple ][ clone that included all the professional extras like an 80-column card and a Z-80 Softcard to run CP/M.
Word processing was an obvious bonus, especially since my handwriting was terrible and I had learned to touch type in high school.
WordStar was great mostly, because it immediately told you how to get around after launching, giving you a legend of the most important navigation keys and the option to hide/restore the help menu at any time to not waste precious 80x24 screen real-estate.
Word and Multiplan likewise gave you immediate hints, although they tended to waste the lower lines for menu and those wouldn't go away. But it was logical, dense and Word had inheritance for formatting, which was crucial for consistent documents. Multiplan was also always way more logical than VisiCalc with it relative and symbolic references in the formula language and I never felt any temptation to use 1-2-3.
WordPerfect left you with an empty screen after launching. In fact just trying to get out of it without resetting the computer turned out to be difficult: none of the known keystrokes worked (this was long before SAA and there was only one function key labelled "CTL").
Perhaps RTFM would have made all the difference but with WordStar there was simply no incentive to change and then the Turbo Pascal built-in editor with WordStar compatible commands was the main tool for editing code anyway, and not even just for Pascal.
Function keys only ever arrived with the IBM-PC, none of the early computers had them. But to get to them, you'd have to leave your home keys and look at the keyboard to find them, a complete break in the midst of writing, that WordStar controls didn't suffer, as long as the Control-key was in its proper place. And then they even started to move the function keys from the left to the top, where chances of hitting them blind were even worse! But that's another story...
Combing back to WordPerfect: I've always felt that a product that left me near helpless right after starting, should never be called WordPerfect: nothing perfect about being left in the dark!
I guess that always felt a bit arrogant so I felt little inclination to ever change my mind.
But I know that some of my favorite writers just loved it, so I guess it did a lot of good for me eventually.