I realized early on that using ANY macro with a specific name would make for more work down the road. So here's what I've done for those "universal" macro's that could be used on any team I run (ie follow, focus etc...)

First, on my main i have a basic invite macro with a free for all option. Looks like this...

/invite xoss
/invite ioss
/invite loss
/invite joss
/ffa

I use the MTool addon and all my characters are whitelisted to auto accept invites. So I just tap this macro twice (once for invite, second to set ffa) and my group is up and going. Now, since I invite the same order every time the group members are in the same party slot every time and my main is obviously always the leader. This also makes it easy to setup healing macros. Since they members are in the same slot each time it's easy to remember who I'm healing with my resto shaman. I map all his heals to the numberpad 0-4. 0 always heals main, 1 always heals the healer, 2 always heals Ioss, 3 always heals Loss and 4 always heals Joss. I set it up this way so that they are numbered based of how they appear on my mains group window. Makes it really easy to know who needs a heal and which button to push without much thought. Basic heal macro looks like this...

/stopcasting
/target party2 (or whatever party number you want)
/cast lesser healing wave

Follow Macro (mapped to G key)

/focus party1 (this sets it to the group leader, the main)
/follow focus

Pretty simple. And it will work on any team I run. Since I hit that key a lot I'm always pretty sure my slaves have their focus set to the main. Then I just make an assist macro (mapped to V) to /assist focus and I'm done. Best of all, no matter what team I run these macro's will work without having to be changed. I tried using the F1-F12 keys but I kept using my left hand and taking it off the ASDW position. I didn't like this. I quickly realized that the number pad numbers are totally seperate from the 1-0 across the top of the keyboard. I preffer using the 1-5 across the top for main's abilities only, QERF for shared DPS and the number pad keys for Alt abilities like healing and totems since they are right next to the mouse hand.