I don't play tank much normally and I never used to use cover much until they added an animation to make it clearer who was being covered. So since then I made this little macro to make life easier in certain situations.

/micon cover
/tpc
/ac Cover <t>
/tlt

Basically this will target the closest party member, cover cover and switch back to last target. It has its up and down sides. But if there is only 1 melee in range it is the fastest was of applying cover to them.

Let me know what you guys think of it.