Parts cost for new front rotors and pads well under $200.

Parts cost no more than a Chrysler or whatever. Nor is the maintenance.

My rotors were $37 each for Wagners. Set of pads the same. Regular serviceable brakes For the daily drive and road trip taker. If you wanna play boy-racer, YMMV, but if that was the case, you would not be asking the question. Call it $120 all in. Zero special tools involved = couple of hand tools and easy after dinner brake job.

Brake fluid change will cost you about $10 and a helper to do it old school.

There is absolutely nothing special or magical about the tasks you need to do. It is the same process on an E53 as it would be anything else.

The cost you are quoted includes substantial markup on the parts, some of the electric bill, some of their wages, and a bit of your skin for good measure. Decide what your time is worth (or available) against the cost.

If your question is: Is this as easy as any other car? YES.