Resto, +healing = +spell damageFollow

I have not seen it yet displayed elsewhere (but have to admit that I did not check for very long...), but I noticed two things:

Starting with the common knowledge: with the patch 2.3 many +healing items were upgraded to include +spell damage (in a ratio of about 33% of the +healing seems to be the avarage on both my resto druid. So far, probably "old news to all".

BUT, the first thing I noted: as my resto druid happily found out patch evening (he is enchanter too) that ALL of the +healing enchants give +spell damage too. that applies to healing enchants on rings, weapons, gloves, bracers etc.

The second thing I noted is that for a resto druid in pvp, especially in small team arena (2*2 and 3*3), where a resto druid usually has slightly more time (with HoT's ticking) and myself I try to squeeze in (between heals and CC spells) a moonfire and an insect swarm (specced 11/0/50), this whole additional spell damage thing does make a difference. I tried some last night and it certainly felt this way to me.

To make sure this was not just a feeling I tried doing the math (as an amateur) and after that it seemed to make sense:

Previously moonfire (+/- 960 damage) and insect swarm (792 damage) added up to 1752 damage (preferable on both arena opponents). The extra spell damage (over 600 on my healing gear) will add 108 (0,18*600 on the initial damage of moonfire), 378 (65% of 600 on the DoT of the moonfire) and 438 (73% of 600) on insect swarm, adding up to 924 damage EXTRA in 12 seconds (and totalling 2676 on each opponent). Given that these are instant casts and can easily be squeezed in between heals (and on the run), I would say it becomes worth it (as small teams arena matches rarely last long enough for me to go OOM anyway). In a one minute arena fight casting this on the run twice on each opponent adds more than 10k damage to the other team.

I have not heard other classes cry nerf yet, so either it is not really a big deal in the grand scheme of things in arena or my calculations are just plain wrong. Any thoughts amongst the more experienced theorycrafters around here (and I will humbly bent my head if my feeble attempt at reasoning gets torn apart).

I spec'd dreamstate so I cant get enough of it. I was able to drop a few pieces of gear to free up bag space. Most of the time my gear switches between healing and feathers are only for spell crit.