I don't know exactly when this change went into effect, but today a guildie of mine mentioned that when you're mounted there's a delay between when you activate a skill (press the button) and when the animation happens. Essentially, in the past when you activated a non-targeted skill while on horseback the skill animation would happen as you dismounted. I run solo a lot of the time, so I have a lot of experience using a couple of skills to quickly dismount when a ganker opened on me. So I tested it out with a few skills that I know used to animate instantly from horseback: dark cloak, reflective scales, and green dragon blood. Whereas before the ability would fire as you dismounted, now you go through the entire dismount animation before the skill animation happens & the ability effect is applied. I haven't timed it precisely, but at a guess I'd say it takes a little over 3 seconds (or a lifetime when a ganker opens).
I don't know why this change was made, but it sucks and I'd like to see this reverted.
Unsubbed and no longer playing, but still checking the Alliance War forum for the lulz.
Pox Dragon Knight
The Murder Hobo Dragon Knight - Blackwater Blade
Knights of the WhiteWolf