If you have Swiftmend, you should have this glyph. No arguments; it’s just that good. I’m not kidding. It gives you a heal that works just like Swiftmend, without the need to reapply a HoT. It saves you mana and increases your healing done. There is no reason not to get this glyph.
However...is that still the case?
With 3.1 we saw the mana regen nerf to innervate that almost necessitates it being glyphed to squeeze just a little more effectiveness out of it. Two new glyphs entered the scene: Nourish and Wild Growth. Though one is more a tank healer glyph and the other a raid healer glyph, both are extremely valuable. As well, Swiftmend has more and more become a situational spell, especially with its cooldown and the high amounts of haste in the game making Nourish an extremely quick cast. However, not having to refresh a HoT on the target you cast Swiftmend on may also be extremely valuable in this brave, new, less-mana-rific world.
I have not yet changed the glyphs on Bellwether, largely due to not needing to (as I do not have a guild, I have not entered Ulduar and have not needed to max out my efficiency), and also largely due to this debate over what glyphs are appropriate anymore. While Swiftmend used to be king, I think it's actually been rendered level by the many other options available to us. Rather than being "number one," it's simply "another good choice."
Which, to me, is not a bad thing. Variety keeps things from being dull, and allows for a greater range of playstyle. Hopefully it will not paralyze people with choices, and simply allow for more exploration of their own playstyle (i.e. how often do I need/use Swiftmend).
Though I haven't set up my glyphs yet, I am curious - what is your set up? Why did you choose those glyphs?