The Meaning of Life, the Universe, and Everything.
Boat speed is fine as it is. It's easily the fastest way tot travel long distances over water, and it doesn't go so fast that you completely lose control. I don't think adding more speed is gonna be fun in any way, since crashing into walls in narrow canals constantly doesn't sound like fun to me.
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I'm no longer allowed on this forum. Because I don't have a Twitch account.
Also, this doesn't really fit in with the current enchanting system. The only things you can enchant are tools and armour (and books), so does it really make sense to be able to enchant a whole vehicle as well?
When the developers were working on the new boats, they experimented with a crafting recipe that included a wooden shovel. Perhaps if this were re-implemented, the wooden shovel could carry enchantments that affect the boat's movement. However, this would probably mean adding-in new enchantments that are otherwise useless and just fill up space on regular, wooden shovels (not that they're very utilised anyway).
I don't see a big enough need for something like this so no support.
I know that you're trying to make large oceans friendlier for boat users, but maybe in a different way?
Enchanting wouldn't make much sense, so there should be something else. And here it is: Engines.
1. Firework Rocket boat.
You strap 2 firework rockets to a boat and they give you 20% more speed for 3 minutes.
2. Small Steam Engine
You put a furnace and a pickaxe(as rotor shaft) in a vertical line, and above them you put 3 iron ingots acting as propeller. Gives you 8% speed boost, and it will be powered for (Amount of items burned by the fuel) minutes, for instance, 2 Wood planks will power you for 3 minutes, a Stick would power you for 30 seconds, and Coal piece would power you for 8 minutes. Ultimately, lava bucket could power you for hours!
The problem here is that you can only go so fast in Minecraft. After so long, the chunks load in at a very slow speed because the game is struggling to generate all of the chunks you are traveling through at the same time as saving the ones you've left and removing those from the RAM.
That's probably the second reason why Nether Portals are the best form of transport in Minecraft, the first being that they cost no resources to maintain and the obsidian that is required to build them is easy to obtain when you have an Efficiency V Diamond Pickaxe.
(Of course, for the sake of preventing saving a whole bunch of unnecessary chunks that you will never mine or build in, it's probably a good thing that you can't travel tens of thousands of blocks in such a way that takes the same amount of time as using a Nether Portal.)
I get offtopic a lot, be warned. I also often mention a Minecraft clone called Minetest. The clone is nowhere near playable with it's default game in my opinion, but it's at least the start of a good open-source voxel rendering engine, and maybe one day it might be decently playable.