OMG, I am ROFLMAO. I use both quite interchangeably and they are no difficulty at all. I sympathize with not wanting to change, it is never easy to give up what one is used to.
For those of you with issues in this regard all you need to do is come to Canada and buy yourself a set of measuring cups, spoons, and dry measures. BOTH systems are recorded on each.
For example, a one cup measure would have on one side the Imperial measure of 1/4, 1/3, 1/2, 2/3, 3/4 and one cup. The other side would have measurement from 1 ml to 250 ml. How hard is that? So if your recipe is in metric, turn your cups to that side. Imperial, turn them around.
And Rainee, there are 4 cups in a litre or 1000ml. There is no such thing as 2/3 of a litre it would read 667mls or something like that.
I think it is pretty funny that in Canada we weigh ourselves in pounds (most often), gauge distance in kilometers, and cook with both metric and imperial.