I've seen many suggestions for dicing or chopping eggs for different meals, but never mine. For years now I've used the large holes of a grater. It is fast, you have uniform pieces of egg and it is great for egg salad sandwiches, sprinkling on top of spinach salads, and even stirring into your potato salad. If you're like me you don't like large chunks of egg whites in your food and when you use a grater there's no big chunks to deal with! Fast and clean up is a whiz!
I use my egg slicer for both eggs and potatoes for potato salad. Just slice once, pick up turn and slice again. It's just the right texture for my family.
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Instead of chopping potatoes and hard boiled eggs for potato salad, I use my cheese grater. What I have is called "8 in 1 Lightning Shredder". The largest shredder has holes almost 1/2 round.
This kitchen tool can be helpful for getting cold butter into small pieces. This page is about using a grater for butter.