When you shoot less and paid more, it minimises the issue of burn out, instead of shooting 80 weddings, you could do just 40 which allow you time to think in the quiet time to develop something new within yourself. This is the way to create more and more market leading shot.
If a photographer treat photography business as just getting assignment, it is not any different from working with a company in a corporate world.
Many feel burn out simply because of the things that you say, doing same old thing everyday. But fact is you can't afford to keep doing same thing every time, you either refine or create your work to grow.
If you know photography is a passion, you have to protect it... Simply have time doing what you enjoy.
Yes, it is never easy when you get busy, but it is much nicer problem to have then jump in and discover jobs just don't come in at all, that generally kill both the passion and confident, and this is generally blame on not having the right product for the right market and don't understand business side.
To really enjoy photography business, you need to enjoy the photography and enjoy running the business. I love both so I am really love what I love doing.
Many sees things from negatives side, but if you have a positive views to many situation, you will be able to get to where you want with lots of hard work and a little dose of luck.
Just another perspectives.