Being a PC user and a heavy dps healer I use macros all the time.
Macroing Embrace with Leeches is wonderful imo. It allows you to take off debuffs like poison and heal them at the same time.
DPS spells are great to have macro'd with both <t> and <tt> so you can either dps solo or while targeting the tank or anyone else taking heavy damage. It allows for easy dps in times when you don't want to take the chance of switching targets.
Using a <mo> for embrace and a <t> for heals lets you heal your primary by themselves or two targets at a time (I find using <mo> soley on heals more tricky so I <t> heal)
Not to mention switching your actual summons to macros to swap out your pet skills on your hotbar.
And if your a confident dpsing healer you can swap your bars with macros to make switching between and dps and a healer hotbar. Cleric stance is great for this.
Having a Swiftcast Resurrection macro is always a good thing, and be sure to put in a /p msg so the other healer doesn't waste a swiftcast. Its annoying when the other healer just swiftcast raises without warning making you pop your swiftcast during their delay and you both wasting it.
Whether or not you use macros depends on your comfortability with the job. Some swear by them, some hate them with a passion (as previous posts have shown). Whatever allows you to control your pet and maximize your own performance should be the goal. Don't let other ppls nasty opinions make you feel lesser.