I'm not sure why you bring up call-stack size. Nothing in the OP leads me to think this is an attempt at optimization.

The advantage over the do { ;return} form would be not having to have the return. This has three aspects: not having to type it in the first place, not having to read through it in the code, and not having to deal with what can be a debugging hassle of accidentally leaving it out.

Looks to much like "GOSUB" for my tastes, though.