A macro like the one above will only work if the first spell does not trigger the Global Cooldown. i.e. Wing Clip for a hunter. I believe (but am not certain) that Gift of the Naaru does trigger the GCD.
In that case, you have a few options. The first is to add modifiers to your macros. I find this perfect for my healing set up, since I use the numpad (1-5 for each group member, 0 for focustarget, 6 for everyone to self heal, etc) Each of these keys I would bind to a macro like the one below.

/target Toon1
/cast [modifier:alt] Gift of the Naaru; [modifier:ctrl] Healing Wave; Lesser Healing Wave;
/targetlasttarget

This macro will target Toon1, and cast Gift of the Naaru if alt is held, Healing Wave if ctrl is held, and Lesser Healing Wave if pressed without these modifiers.
My own macros end up being a bit more complex- but this is the basic form if you want to use modifiers. I use the /target command as it saves some characters if its a longer heal macro vs putting target= in each modifier line.

Another option would be to use /cast random (might require some key spamming, but it will toss Gift of the Naaru in the mix as a heal and save mana)
i.e.
/castrandom Gift of the Naaru, Lesser Healing Wave

Or, you could use /castsequence in the form below, but there are some catches.
/castsequence reset=180 [target=focustarget] Gift of the Naaru, Healing Wave, Healing Wave, Healing Wave, Healing Wave, Healing Wave, Healing Wave;

The catches are: reset=number always resets each time your press it. So Gift would not be cast unless you didn't heal for the specified amount of time or you cycled through all the Healing Waves listed.
You could use different reset conditions, like a modifier key (probably your best option but requires manually resetting it- one more thing for a highly taxed brain to process) or nocombat etc. But I haven't found anything that works well with this scenario. I'm sure there are people with more experience than myself at writing macros, so they might have a solution beyond these- but these are the only ways to pull it off that I know. Best of luck- let me know if Gift triggers the GCD- i'm curious now.


-Moxy