It could make a big difference but, as you age and long sightedness kicks in, you may still need glasses again.
Your other options are
- high refractive index glass to give thinner lenses
- contact lenses
I used to be -8 in 1 eye which is why I opted for contacts but I always have glasses for backup and they have high RI glass. As I have got older my eyes have got better and I am only -6.25 in the eye that was -8 now.