At the minimum, a few years not hibernating seems to have no effect on the animals. This means you have some time to make up your mind and learn before you take the leap into hibernating should you choose to do so. I will tell you that in my experience and that of some others, in BOX turtles, hibernation keeps breeding regular and lack of it tends to send them into unreliable breeding, but only for species or specimens from areas which have real hibernation (not florida box turtles, basically, or gulf coasts). There doesn't seem to be any other real effect that I have heard of. If you are not breeding them, (if this even applies to hermann's/russian's/greeks) then there's no reason other than personal preference.
It is a risky proposition for some people it seems. I have found that hibernating my animals in a climate not too different than what they would naturally have and letting them choose how to do it in a large pen with a variety of options has worked well. By similar climate I use winter rainfall volumes and number of days below 40F on average. By different areas I mean in some spots I have dug down and mixxed in sandy soil to make it easy, in others I have piled mulch, etc. They do not all choose the same spots and I have yet to lose a box turtle in hibernation. I do not know if any of those tortoise species would handle hibernating with rain levels comparable to what I have in NC, however.