Nope. The convenience of instant casting my mount is too valuable for me to care what I am riding. Having only ever played a Druid (with a brief stint as a priest) I think it's killed any interest in mounts. I think I'll start using them in BGs because I am always so much slower than everyone else for some reason, but aside from that, never.
Out in the world mount is only 10% faster than travel. Not sure in other places.
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Only in PVP. the utility of travel form is just so good for all world content. Especially with wild charge where you can jump down cliffs and just wild charge to survive, and as a way to get away from enemies
If only we could transmog our mount form from mounts owned .. but on my druids i use no mounts most of the time it's travelform
No, I mostly use travel form, but I do use mounts for repairs/AH/Transmog.