Its rare, mostly for former employees who come back. I do know a few people who got tuition reimbursement but one actually said their salary was low and its paid back over several years and then if they leave everything paid over the last few years has to be repaid. Mind you its a smallish company and I think for them it was a way of trying to hold on to an employee.
I would rather have the higher salary though that way you aren't tied, it helps during negotiations when you switch jobs. Trust me if you max out loans and get a decent job coming out of a top school you shouldn't struggle making minimum payments. Figure right now most people I know who took tons of loans are probably paying around $1500 a month. Sounds like a lot but most people pay it off within 5 years and if you are in a field (MC, IB, lots of jobs seem to give 15-20% bonuses to post MBA grads) with bonuses you can plow those into the loans.
Kellogg Class of 2010...still active and willing to help. However, I do not do profile reviews, don't offer predictions on chances and am far to busy to review essays, so save the energy of writing me a PM seeking help for these. If I don't respond to a PM that is not one of the previously mentioned trash can destined messages, please don't take it personally I get so many messages I have a hard to responding to most. The more interesting, compelling, or humorous you message the more likely I am to respond.