During the hot summers, I put water tanks under the end of the AC water runoff pipes of the building. Most of the water is otherwise wasted, and I save lots of water when I irrigate.
Recently, I've been (in the last two years) into tropical plants, a dramatic shift from strictly succulents and fruit garden. I still tend my succulents and fruit trees, and just added extra activity in the form of tropical plants. My plants include Aroids, Begonias, Hoyas, Calatheas and Maranthas.
There are cons and pros for AC water, depending on your usage.
The main "con" of AC water is lack of nutrients, but this can be compensated by adding nutrients periodically as compost or adding them into the water, so this is not a problem. I don't think AC acidity is a concern, because it is the same as rain water in this regard. In addition to AC water, I have the waste water coming out from an osmosis filter. My brother uses the filter to prepare pure water needed for his sea-water aquarium. The municipal water, going through steel pipes, ends-up with a high conductivity, and you cannot just add sea-salt and put the corals in. Each time he refreshes some of the water, he runs the filter and stores clean water to which he later adds salt. This waste-water is not wasted, and is stored in a tank which is later used in the garden. This has more nutrients than the average municipal water (all "contaminants" are more concentrated) and can make-up for the lack of calcium and low pH.
The pro of AC water: They lack salts and other chemicals which may accumulate in the soil, especially if you don't flush enough when you water. This is essential, and even crucial, for many of my tropical plants, and Calatheas in particular would have otherwise ended with brown patches all over.
My advice is use it. If your plants love a higher pH then adjust it with calcium or other additives available in hydroponic stores. In hot days they even supply water for all my plants and the garden.