The current load indicator (the small spinner in the upper left of reports) isn't really sufficient for users. On our larger reports, which can take a while to load, the user sees a large empty area ...
This is a great idea. Even the spinner wasn't enough for some end-users to know when the filter was applied and I would have to train them on that. Greying out the visual until the data is ready is so intuitive that it would require no training for the end users to understand.
