Have to echo Starmind there. Holy Priests are good targets for Wisdom, absolutely. Holy is a mana-whore because our most efficient playstyle is to spam the expensive heals. Any Holy Priest will thank you for getting Wisdom.
Now, could other healers use it too / more? Any healer can use it, no doubt about it. Is it worth more on other healers? That's highly debatable.
If you look at the log stats here
https://www.warcraftlogs.com/statist...y=4&metric=hps you can see that there is no "best" healer. A different class outshines the others in every fight, Holy Priests shine in at least 3 out of 10 and, if you set it to "All Bosses", you see that everyone is sort of at the same level. The healers are very balanced this tier, actually.
Sure, more skilled players will always outshine others but that's just that. In my raid I regularly outshine all other healers, including a Druid and Holy Paladin, simply because I'm the better player. Doesn't matter that Druid is supposedly "the best" healer this tier.
@
Galaar: If you want to take a look at what your priest should be casting, feel free to have a look through my logs from yesterday. We cleared 10/10 Normal Nighthold and 4/10 Heroic and I'm ranked pretty highly on most of them. Should be a fair indicator.
https://www.warcraftlogs.com/reports/v1JkN7zQBGRVW3cX