do you mean for general recipes, or just for gregtech related recipes? because i can think of 3 distinct other mod related objects that require, but do not consume empty buckets:
1. LXP absorber (liquid exp)
2. buildcraft pump (buildcraft)
3. logistics fluid basic pipe (logistics pipes)
attached are images of crafting 10 logistics fluid basic pipes with a second image of the buckets not consumed
I'm not familiar with #1 or #3, but I'm fairly sure that making a buildcraft pump does normally consume the empty bucket (I just tried it on a vanilla crafting table, and the empty bucket was consumed). Some modpacks might change that behavior via Modtweaker, though.