I don't feel, especially on the wave of the recent HS nerf, that any Holy pally can skip Crusade. HS is our passive HP heal, and one we will be using more or less on CD, or any time we are moving without a 3 stack of HP. I'll have to run a few parses and see how much healing 30% of HS is as opposed to 6% overall healing. But speaking from a usefulness point of view, I personally feel 30% on one of my main nukes to be more practically useful.
Edit: Also, I would think PoTI procing beacon is intended, unless LoD procing beacon is NOT intended as well.
I suppose in a way it's a matter of playstyle and also depends on your synergy with the rest of your raid group, but I personally feel that HS (especially after the nerf) is more of a filler to trigger procs and get that HP charge than a real heal. The healing it does is underwhelming even with 3/3 Crusade, and that will be even more noticeable with the enormous Cata healthpools.
Right now, HS is roughly 10-15% of my overall healing, so Crusade would be at best around 5% overall increase - but much of it is wasted because it's just random sniping people at 90% to get that Holy Power, whereas the 6% from Divinity is always there to benefit when I actually need heavy throughput. There's also the small increase to heals done to me, not exactly a big deal since PotI+Bubble alone is enough to take care of my survivability most of the time, but still a bonus.
@ Aradhir, I'm pretty sure LoD proccing beacon will get nerfed - it is really overpowered in its current state, and has to go, most likely with a nerf to its healing done on top of it. As for Spirit... I don't have a lot of beta raiding experience or any real calculations to back this up, but I'd imagine Spirit will be a key stat at the very least throughout all of first raiding tier. Being able to use DL / FoL more liberally is likely more useful than having a couple extra % of Crit or whatever, and our mana regen does need every bit of help we can get - Divine Plea is extremely situational, and combined with even more situational (and weak) Judgement spam, that is all we have for regen apart from Spirit.