> You just have to not care about what you're doing
You do have to care, you're just mistaken about what it is people in big corporate companies are actually doing. What they're doing is advancing their own careers and those of their network.
> how well it could be done
Reflected in the rate of advancement, which can be actively maximized through effort and attention.
> what tools you're using to do it.
The "work" is in fact one of several tools used to advance the career. This is why it is so frequently performed with little care or love. Often it only matters to the career to the extent that it can be declared "done." Most companies lack mechanisms to tie what happens later back to the original doer, so the marginal benefits of care and quality to the career are low.
If you care about the actual "work" and craft it's best to find a place with little to no concept of advancement, in my opinion.
EDIT: Some people really are just phoning it in for a paycheck, and who can really blame them? Others who may appear to be lazy or careless simply have a different set of priorities. If those priorities offend you but the person is nevertheless succeeding, probably a good idea to move away from that environment.