NO, NO and NO. Yorick is already way too strong. I play him and it's just too stupid some times. Being able to be 3 levels over the other top most of the time? Something is wrong with this champ.
First off, Both Q and E appears behind your opponent so no problem there. You should never pop W between you and him. And if you are so pissed off about it, buy Phantom Dancer.
Second, Q should NEVER give his bonus on activation. Hell, it ends up as the same movement speed that Garen's Q.
Last off, Q should never hit turrets because it grants so much stuff anyway. Just like how Wukong cannot cloud dive on a turret and needs a minion to get the bonus ATS, Yorick shouldn't be able to get his Q on the tower, dealing a ton more damage and have a ghoul that will tank 2 hits for him more plus dealing tons of damage to the tower. Get enough health and damage right now and you can perfect dive a turret with no minion around you...
If you can't see how Yorick is just too good right now, you haven't played him AD health.