Yeah the UI is terrible for healing. I play in 1920 x 1080 on 24 inch Monitor--they still manage to take up a ton of real estate while being super super tiny and hard to read. they also blend into the background. I know that except for the Epic dragon I ran that I did some overhealing to compensate for not being able to read the bars right, or quick enough--can't see them in peripheral vision very well anymore.
Pretty much very straining to the eyes, and will not be playing my main alts as much anymore. A girl can't get wrinkles