That is very true! It is the misuse of power that is the wrong thing, not the unification against a part that is soo much stronger than the individual and that we are so dependant of. There aren't that long ago that we had slavery under feudal societys in Europe. Generally they ended at the end of the 18th century, in Germany in 1806 and in Russia slavery wasn't abolished until 1861!!!Well what you detail below is a complete misuse of union power and it's hardly surprising you feel the way you do.
On the other had you must contrast such a situation with its polar opposite. A situation where unemployment and poverty are rife and an unscrupulous employer can exploit the labour pool for subsistence wages, where workers can lose their job for no reason whatsoever. Conditions that have existed in history throughout the developed world and still exist today in the third world. Unions are the reason that we don't work under such conditions today.
It was the unification of the workers in the 19th and in the beginning of the 20th century that gave us most of the rights we enjoy today. Now we take them for granted, but nothing was given for free or out of good will from the masters. Today unions are established parts with a lot of power. Power that has curupted the union leaders as it has with every body else it affiliates with.
Power is the bad guy here, we need to brake down the power structures and spead it out on every individual, make it more direct, democratisize the representative democracies we live under.
EDIT: Slavery was the wrong word here. Serfdom was the one I meant.