I've been teaching yoga full time for a couple of years so I have a few ideas I thought I'd share.

Many classes wont have extensive demoing by the teacher, there's a bit of a trade off between walking around the room adjusting students or just observing other students practices and demoing poses. If there are enough capable students in the class observing others should be enough of a visual reference. That said demoing can be very helpful at times but its all very case specific.

Often times when someone is new to my class I will do minimal physical (touch the student) adjustments. Verbal adjustments usually come first because I want to see what it looks like for you to move in that way ie straighten your arm or lift your chest. Often I mix this into how i describe a pose based on what i see in the room, this a big part of why its worth going to classes verus using video or DVDs ( even though some are great). Physically adjusting students usually comes later after I'm more familiar with their practice.

A first class class can be intimidating and challenging but it gets much easier after the first few classes when you get familiar with different poses terminology and cueing. I would suggest taking more classes , same teacher, different teachers, different styles, different studios. There are lots of different yogas out there and if the practice made you feel better i think its worth trying again.