Occasional travellers will certainly check specific trains. A regular timetable is useful to the regular traveller where the service isn't frequent enough to be 'turn up and go'.
If I'm in town for work, I look up a specific train to get in - in practice, it's the xx:55ish, with annoying variations - but coming home I just know that the xx:10 service will get me home. If I finish early, I'll jump on the 17:10. If I have a couple of pints with colleagues, I'll get the 19:10 or 20:10. And if there's an evening event finishing at 20:00, I'll curse the person who decided the xx:40 shouldn't stop at my station then get in the car, because the next train after that is the 23:10.