Some big programs that aren’t Social Security: Fannie Mae, Freddie Mac, Sallie Mae, other student loans.
Some smaller programs that cost more than it looks: any mandatory “green” program (wind and solar raise electricity prices by 10-30% and increasing). Regulations on coal (where coal is used, such as Kentucky, raised/will raise electric rates by 40%, and risk blackouts).
Ending subsidies for college loans will have multiple benefits: many PhDs in useless studies will have to cope with the market economy, less propaganda spread onto young minds, lower rental prices in many urban areas, college loan officers will learn to evaluate risk using math, many young adults will work instead of party/have sex at school. I’m sure I’m missing some more.
The big one you missed is that college costs will DROP when students find it harder to borrow money to pay for it.