I think you bring up a valid point (even if you didn't mean to) You mentioned the use of launcher pro which I believe is an alternative dock/homescreen organizer. Most iOS users I have observed are looking forward to iOS due to "new features", even though there hasn't been a tangible report on what those will be. One thing every user counts on in a major upgrade is a new UI. When you mention you could have stayed on Froyo you're right because ultimately, aside from behind the scenes stuff that the average user wouldn't notice, the majority of all OS upgrades (iOS and Android) include that UI overhaul. So I think the standard Android user is a little more patient in wanting a new OS because they can mimic the tangible result of an OS upgrade (a new UI) anytime they want.
I'm not sure Android users are all that patient but it is difficult to compare the way iOS and Android update. I have only had one or two very minor OS updates this year but Google maps has updated 7 times. Google could do a lot to streamline the update process (HTC announcing the will stop locking the bootloader is a good step too) but having the apps that matter updatable via the market makes things a lot easier.