OK, I'm also annoyed with this blow to my preferred playstyle, to say nothing of Anet's ridiculous lack of communication about their decision. However, there's a fact that I'm kinda embarrassed it took me 5 days to notice. Even though it appears that the minions disappear at dismount, the minion re-summon cooldown does start at the time you mount. Therefore, if you're mounted for 48 seconds the flesh golem cooldown will have expired when you dismount. Yes, it suxx and we are vulnerable for the 4-5 seconds it takes to re-summon, but it's not as bad as if the cooldown started at dismount time.