The biggest advantage of Virtual Envelopes is that your money is safe in a banking institution instead of cash in envelopes in your house. Just imagine if you hade robbery, fire, or just plain old forgot where you put that cash envelope with your rent payment. Not a fun time trying to recover that!
Consider putting yourself back on cash. If you think you shop impulsively because it is so easy to use plastic, try to give yourself a cash allowance every week. You may go over the allowance, but you will have to go to some effort to replenish it. This can be a great way to get a handle on spending.