For your priest, try this macro:

/cast [nostance:1] Shadowform


If you are not in stance 1 (Shadowform), it casts Shadowform.
This is beneficial because you can mash the button to activate stances/forms, without having multiple presses pull you out of your form.
For two toons, it has a small use.
Once you say a druid with Moonkin Form and a priest with Shadowform, and one will drop out of their form to do a heal, but the other is set to continue to DPS....
Having all your alternate form toons on one keypress, with mashable macro's is nice.
Just press your keybind for alternate forms, which in this case will put the priest into Shadowform if she is not there, but won't take her out of it.






The Addon Jamba, in the addon's/macro's forum is extremely useful.
You can strobe follow even, so once combat ends the priest auto follows on its own.
Or have a key, where any of the followers/slaves, auto follows the master toon on the keypress.
The master doesn't even have to be in your group.
Jamba is extremely nice for flightpaths, questing, auto accepting escorts on slaves, follow etc.
Highly recommended.