Blind priest healer is more than a meme, it's a lifestyle. Embrace it
Think of it like this. Your brain is a highly trained neural network, designed to react to healthbars dropping. From the general situation of raid health, boss mechanics, geometric positioning and ability cooldowns - you then apply the best option amongst of twenty-seven possible countermeasures* within a 0.2 second time frame. This is what you are trained for. You are a professional - nay, you are a damned healing god, and nobody can do this job better than you.
Not standing in void zones, paying attention to adds, and noticing that the raid leader calling for a wipe - or anything happening outside your health bars for that matter - that's just not in your job description.
*) in an ideal world. But right now, just spamcast flash heal and you'll do better, for less mental effort.