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Me too. I always fill the kettle right up and Mrs LD is always telling me off for it but I refuse to faff about with half a millimetre of water just to find out there's not enough.
And no Mups, I don't reboil it next time, I use a fresh lot.
What you do is put a cup of coffee or tea in the microwave and wait until it goes DING. then you know it is ready.
I sometimes use the microwave realspeed, but if I want two mugs I think it's quicker to use a kettle. Also, with instant coffee, if the microwaved water is really boiling and I put in the instant coffee it can fizz up and overspill (I know I am a mucky pup).
We have a one cup machine....it looks a bit like a coffee machine, but it boils one cup at a time, it can be adjusted for different sizes of cup/mug, we use the kettle if more cups are needed