How reasonable it is depends upon the area. On Long Island, NY, it would be a gift, in large part because of the high local charges to the pumping company when they deliver the stuff to a plant to be processed. But if he's going to pump it dry, and he will do it expeditiously, I don't see that it's that bad, particularly if it includes thoroughly-cleaning the effluent filter. The stuff in that tank looks harmless although smelly, but touch it and then scratch your nose or rub your eye, and there's a fair chance you will be in the hospital for a few weeks, so having someone else clean the filter is worth it for that reason alone.
Forget about the rest of the stuff, including the stuff about the disposer. Lots of folklore about disposers, toilet tabs, laundry detergent, blah, blah, and in 50 years of having a septic tank, it has never ever been an issue. The fact is that the septic tank itself does a very good job of digesting the stuff coming in, and producing the muck that needs to be pumped out. And the tiniest bit of poo is all that it takes to get the reaction rolling properly. Most septic system problems aren't the result of the stuff not being digested in the normal course of things. Very often it's various kinds of stuff making it to the leeching fields that then mess them up. For example, some people try to put in additives that will reduce their need to pump the septic tank by causing more "stuff" to be suspended in the effluent instead of dropping to the bottom of the tank. If in fact the additives actually do that, it's a first-class way to screw up your field. Your field should get water that is as clear as absolutely-possible, which comes from the digestion and sedimentation processes taking place, particularly the latter, thus producing a center layer of relatively-clear liquid in the tank. By code, most septic tanks are overdesigned for the job of sedimentation and can accept more volume than 1-2 occupants per bedroom will provide, especially if you are using 1.6gpf toilets or below, and have a modern dishwasher and washer. The point is that a well-functioning system will take what is thrown at it, within reason. And the septic guys make big money selling additives, which the EPA says unequivocally that you don't need. One idiot wanted to put sulfuric acid in my properly-functioning septic tank, and charge $300 to do so. Septic tank, not cesspool, septic tank. Ummmmm...no thanks, guy. THAT would not be helpful.
All that happened to you was that the system functioned properly and your effluent filter worked properly and now needs to be cleaned. (And, BTW, a lot of toilet paper isn't of itself a problem. It will eventually digest.) Perhaps if your home hadn't been used in a while, some of the TP floated over to the other chamber when the tank started to refill, rather than being displaced by the baffle. It should stay where it is now that the tank is full again. (Just a surmise.) OR, the tank hadn't been pumped recently enough such that the scum layer (the stuff floating on the top) penetrated below the baffle. The general rule is that you want to pump when the sludge layer (layer of digested stuff at the bottom of the tank) and scum layer together take up more than a third of the volume of the tank. For most folks, with a properly-designed system, a pump every three years is more than enough.
Our jurisdiction actually pays for a free pump once a year, since we pay sewer tax but are one of about 100 homes that don't have a municipal sewer to be connected to; our area was left off for some reason when they put in the sewer system decades ago. Once a year is waaaaaay more often than we need, but we do it because it can only help prolong the life of our system.
Good luck!