That last line is a straw man argument. I don't think anyone views that as "working like a dog." Most eventually want you seeing consistently 35-40 patients a day, working what appears to be an 8 hour day that quickly seeps into 10+ hour territory otherwise you run the risk of falling behind for "another day to play catch up." If it's your own practice, or you own equity in it, work all you want. It's your baby. You'll even see those 5 patients who can't come in during the week due to work on a Saturday Morning for them. It's ultimately your business, your pride, and your income stream. Reverse that scenario in employment, and you'll definitely be in no mood for that.
At the end of the day, it comes down to what someone wants in life. If you just want to be told what to do, make some money, have no equity, and just come home in your Honda to your house and call it a day, sure, by all means, I respect that. Everyone is different. I always believed in being a business guy, owning a practice, being successful, and running the show. It's just me. Even if it means working a lot of hours for that. Scared money don't make money.