I prefer a forward cant as well for a few reasons. I'm up and down in my desk chair through out the day and some days in and out of my car just as much. With something around an "FBI cant" when seated the pistol is about parallel with my torso (not scarring the car seat or leather desk chair). As for a standing draw, well, many years ago, long before I had ever heard of the "interview position" I got in the habit of standing that way in stress situations with my weight slightly forward ... well, from that position, the natural draw action involves bringing your hand back towards the firearm. As such, a mild to moderate forward cant leaves the gun positioned perfectly at hand, especially if moving into a slightly bladed stance during the draw. Furthermore, moving from an "interview stance" to draw, if you are CC with an open front cover garment such as a sports coat or jacket, sweeping the garment back out of the way becomes a natural part of the entire transition to and actual draw stroke.
When I first started carrying I thought I would prefer a vertical holster for various reasons. Several years of daily carry has shifted my preference firmly to a slight forward cant IWB or OWB.