I suspect most people who do deal with bulk CSV files all the time do as well. I'd be curious about how gracefully it handles large CSV files.
The lack of quoting support kills it for my use case however. I wrote my own tools, starting with csv_cut because cut(1) didn't do quoting.
(2) Many of my columns are free-form text containing commas, carriage returns, new lines, tab, vertical tabs and file separator (0x1c). Occasionally, text is in UCS-2/UTF-16 or uses UTF-8 and foreign characters (a non-trivial quantity of the text I process is in French for example.)
(If you read between the lines here, some columns can contain MLLP-encoded HL7 messages, others contain free-form text and I'm in the medical field.)
miller handles large files well. it's fast enough, and doesn't hold entire file contents unless it has to (e.g. sort). so gigabytes of input data are fine.