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I stand in the shower and turn it on hoping it was indeed left with the shower head disabled, then I turn it on low pressure and let water flow until its warm.

No need to waste arbitrary amounts of water! If you don't have a normal shower (you're american) and only have some on/off shower pressure control, step inside, run the tub until it's warm, and act like a human being who can take the .3 seconds of cold water that may still be in the pipes between the diverter and spout. Odds are the cold water was drawn down from the water rushing out of the spout anyway, unless you have an adjustable showerhead. See step one.