Your argument about crit being better when progressing on LK HC is just laughable; PW:S does the job at controlling Infest and the "nice extra buffer" you talk about is just not needed and is of course also random as hell. As far as I recall a PW:S Glyph crit will grant you a 1k DA on the target, not something I see saving my day or any situation gone bad, but being able to respond quickly and firm with fast heals whenever something goes not as planned, is something I find extremely handy, almost a must.
There are numerous situations on especially LK HC where having loads of haste will come in handy; abnormal damage taken by the raid during trasition phases (PoH), Holy Paladin dieing (haste prevails so much better at tank healing/assisting than crit does), Infest ticks on the raid/on a few single targets (PoH + Divine Hymn /Penance + FH or GH) and last but not least, healing in the Frostmourne room (PoH + Nova).
Tabard, ahhmm, all I got is this fancy shirt ^^
Anyways, as a little kick in the teeth; it's hard taking you serious, seeing you still run with the FH GLyph.... (I'm being serious here)