Riding a floating disk.

[Ditto]

^^ Exactly. Hitch it up.

Again, I don't understand why 'following you as directed is a problem.' I agree you cannot ride it, per se. You just constantly redirect it. Its directive is 'stay withing 1 foot of my nose.' Sit on it. Proceed to lean forward. Lo, it follows you! It's not your fault that it's under you, that's just a perk.

You wouldn't claim a familiar on your shoulder is not accompanying you. Above, below, in front, behind, if you're both going to the same place it's all the same.

@Aquillon: No, that's very silly. It moves at your speed. Your speed while riding the disk still equals your speed, so saying you can add your current speed with a potential speed (if the disk were moving) doesn't math out. I'd probably say you can move at Expeditious'd speed for the duration of that spell. 'Normal' would have to be a speed you can maintain.