Yes. I hate receiving documents in .docx or any other proprietary format, especially if I have not agreed to that format prior to receiving them. I like plain text if at all possible. I'll happily receive PDFs because I can view them under Linux/BSD, but others piss me off. People THINK MS Word is the de facto business standard. It isn't. Text and PDF are the standards. Never had issues with either.

I had a friend tell me my CV should be in PDF and locked down to prevent recruiters and others from changing it to something other than the original. I know recruiters are fond of changing things up without informing you.