From my standpoint, the keyboard is not all that complex--it's the lousy, poorly written manuals that come with them that makes using these wonderful machines so difficult.
I sincerely believe, however, that those of us who sing have the edge when it comes to operating the keyboard on the fly. Non singers must constantly use both hands in order to entertain their audience, therefore, they cannot select the next song from the keyboard's internal memory before ending the song they're currently performing. This leads to extended periods of dead time between songs, which from my standpoint, should be limited to three seconds or less. If it takes more than three seconds to select the next number, you've lost the audience.
Yes, keyboards have become more complex. However, those that have taken the time to continuously explore the inner workings of their system find that this is the most incredible device for entertainer/musicians that is available today. Just 20 years ago, when I had nothing more than a six-string guitar, a lousy amp and more guts than tallent, drum machines came out, and everyone said they were really neat but too complicated. Now, two decades later, technologically, we're light-years ahead. Now if they would only find good manual writers I for one would be a happy person.

Gary