I fought the siren's song from Android for a ling time. While there is plenty to love with Android devices, too much of that stuff is just not anything I will use.
The other kicker is battery life. Heavy users cannot hope to last a day, especially with the large screen devices like the Evo. It's especially noticeable when the phone is new to you because you'll be playing with it so much, changing the background image, fussing with settings, etc. You can always get a high capacity battery to help, but then your sleek and sexy Evo becomes a brick in both size and shape.
Everybody should try an Android device some time, maybe for a week. You'll see the hype vs. reality of Android, maybe get some ideas for apps on BlackBerry, and probably scratch an itch that has been nagging at you. Some folks will find that Android is really the right system for them. That's good too. Everybody acting in his own self-interest make the whole machine run best.