This is a great blog that I just discovered today, thank you! I've been using Excel for many years, and done a lot of incredible things that few people could imagine is possible to do with Excel, including Natural Language Processing. I will share some of this stuff over time. In the meanwhile, you can check my article Advanced Machine Learning with Basic Excel, available here. Below is an example of some Excel visualization, in the context of supervised classification. My spreadsheets are available for free on my GitHub repository. I will add many more in the future.