The new geysers are pretty cool, and they have another potential use in the nether and large basses: elytra updrafts like in the glide minigame.
When you put the potent suffer and magma under lava, it could give you a nice, consistent height boost, letting you fly extended distances without rockets if you're willing to build the infrastructure.
Natural veins spawning in the lava seas would make exploring the Nether interesting, and potentially unpredictable as well.
Link to the suggestion: https://feedback.minecraft.net/hc/en-us/community/posts/45435571824909-Geyser-updraft-for-elytra-glide-minigame