Sad to see you're being downvoted for valid points. I'll admit I'm glad I don't have a job that involves staring at CSV or XML all day but I've found csv-mode a

Sad to see you're being downvoted for valid points. I'll admit I'm glad I don't have a job that involves staring at CSV or XML all day but I've found csv-mode and SimpleEmacsSpreadsheet lacking over the years, and large XML files can indeed be slow.