Is spraying houseplants with a light water mist good for them?

Wouldn't think it could hurt anything by doing this. At least, the leaves will always be clean, and that may be good for the plant as it can better absorb sunlight and moisture that promote growth.

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I've done it for years. It helps prevent dust buildup and increases the humidity for a short time. A lot of houseplants are tropical understory plants that evolved in humid climates, and indoor air, which is often heated or air conditioned, is a little too dry for them. Spraying the foliage helps. So does resting the pots in broad trays of rocks that you keep watered. Both raise relative humidity around your plants. The only plants you shouldn't mist are the desert-like ones, like cacti.