Crew - I'm not sure where you've got your information from, or why (for that matter) you seem to have such a chip on your shoulder about teachers in general.
I spoke in my post as a qualified, working teacher who KNOWS what is legal/not legal/expected of these extra, non-teaching staff. TAs are support staff. Cover sups are a slightly different creature but they are NOT allowed to 'teach'.
Teaching is not a simple, straightforward job. Goodness, if I could walk into every lesson I taught with a pre-written plan, resources etc all laid out for me then of course I'd think it was the easiest job on the planet.
Short, mid and long-term planning take a high level of skill and experience. Being responsible for GCSE and A level classes; marking and moderating exam coursework, liasing with parents/outside agencies....these take time, skill and training. That is why something such as the PGCE and NQT years exist - and they are tough. I worked as an LSA with disabled students for a year before starting my teacher training - even so, nothing could have prepared me for the pressures of job.
Regardless of what the media/OFSTED say, the majority of teachers are bloody good at their jobs and work exceptionally hard for the benefit of the kids they teach. Its not about being 'worthy', its about taking pride in a chosen vocation.
Anyway, if you truly believe we'd be better of without teachers then I'm not going to change your mind. I just think you have a very two-dimensional view of education and this is a shame. I also think cover sups are woefully underpaid for what is asked of them. We all know they are a money-saving exercise, nothing more.