I use the measure tool very often, and for two main reasons:
1. To measure distances in parts/assemblies so I know how much to modify the related features to get the dimensions just right.
2. To drive flat pattern dimensions for sheetmetal parts. We create our parts in the flat, and need flat pattern dimensions (which dynamically update). The measure feature is the only way I know of how to do this without writing ugly relations.
Off the top of my head, if there was a button (like the right mouse click) that would remove the references for the measurement you just took, it would speed up the process of taking many measurements instead of having to press the button on the window each time. Or even another button that would keep the first measurement, but let you pick a second reference to speed up the process of measuring from one area would also be nice.
Going back to the flat pattern dimensions, we use these in family tables. The reason is, if there is only one instance you can just make a dimension in the drawing instead.
Sometimes when designing, and especially in tight areas where there is little room I make sketches. I reference certain features then make a reference dimension. This allows me to quickly view complex relationships between features to check critical distances. Sadly, due to the simplicity of the measurement command I do not think showing a small note in the model would be easy to implement for these complex relationships.
I personally find this utility useful, especially for design.
