What mounts do you use primarily?

Some of us are mount collectors, and for the love of me, Ashes of Al'ar will never drop, but that's another story. I seem to use these mounts all the time:

Sandstone Drake — I love dragons, and being able to carry someone on my back. Some friends of mine love being escorted through zones without a hitch. :)

Traveler's Tundra Mammoth — Repairs are always a good thing, and it's nice to sell basic materials as well as food for pets.

Reins of the Grand Expedition Yak — Another repair mount, but now since Draenor was released, having a portable Transmog mount makes this one awesome!

Azure Water Strider — Many a days I traveled across the oceans to cut down time to getting to certain zones, skipping content I've done over and over to the point of boredom. THIS mount is indispensable. I use it all the time.