My wife will point out in the evenings if I didn't text her much during the day, or even send me a message some point during the day asking if I'm alright. These days are few and far between, usually just meeting heavy days or when I really get sucked into a time-sensitive problem.
Yeah, people act like this is uniquely weird, but it's quite similar to the sms / IM that many of us do every day. It's just all in one message as opposed to broken up, and it's more intentional.