You’re at the end of mythic. We’ve been 1/2/3 healing this content for ages. That means that most rosters that are still actively clearing (fully) or in end of progress are saturated with healers. Many of them went off spec and heal when there’s the odd chance to. Even on Silvermoon this applies, while being one of the big four servers.
It feels like you’re a little bit quick to include Legion to the current state of the game (and corresponding raiding opportunities). The prepatch and launch of Legion will feel much like a desert flood. It will green up and bloom like crazy in no time. Having the raiding background you currently have, will be a luxurious position when selecting a new guild in the times to come.
Chin up, play some overwatch. We’ll see you in the prepatch! 🙂