The reason teachers fret about Gove's reforms, is because they:
End up spending a lot of time worrying about new forms of paperwork and inspection that may have erratic and unpredictable outcomes, but which is likely to have very serious consequences both for them and the pupils they teach.
Worry about new kinds of tests and exams brought in very rapidly that they sense will not work very well, or which may well be very unfair for certain kinds of pupil.
Have to work with very precise instructions in how to teach certain things that they feel may not make any sense in terms of the particular pupils they have to work with.
Experience lack of access to the senior management teams because they are tied up in meetings linked to academicisation and restructuring, leading to less support in the day job than they really need.
Worry about their pay being cut in real terms because of new localised pay grading arrangements. This might be linked to worries about cronyism.
The reason Gove frets about teachers is because:
As he understands it, since the 1960s, teachers have been delivering a very child-centred curriculum at the expense of traditional knowledge-delivery methods of teaching, which he thinks is more important.
He also considers educational standards in the UK to be lower than they should be in terms of international comparisons, and holds teachers directly accountable for this.
Teachers are pretty expensive since their salaries went up in the 2000s, and there are a lot of them, so getting them working for less gives the Government a good opportunity to save a chunk of the public sector budget.
He is a former Thatcherite turned Tory moderniser, and he thinks that if he manages to look like a strong, determined, Far Right politician who has resolved the above problems, he considers that this will pave the way for him to become Leader of the Party, aka Prime Minister.