If you simply like or enjoy a thread, click the fancy little like/upvote button instead of posting "I like this" or "cool." If someone else has already commented what you were going to write, please upvote that comment.
It feels like the upvote feature doesn't get used much anymore outside of posts of mods like Galacticraft.
The irony here: This post hasn't has a single reply, but 3 upvotes.
I actually do have something to add. In addition to not posting comments like "i like this", you shouldn't post comments like "i don't like this" without having anything to add, either. There's no downvote button, sure, but if you're just posting "i don't like this" without giving some discussion material (y'know, the point of a text-based forum?) then you're just giving attention to a post you think is bad.
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.
Something that would make this a better option would be to allow ones 'thanks given' (up-votes) to be a searchable set in advanced search... or at least able to be displayed in date order given (they appear to display in date order of last thread activity, at present).
Adding a comment can make it far easier to find a thread again as one is likely to remember one's own phrasing, and searching posts can be limited by author. Of course, using this technique successfully requires some on-topic text; 'comments' like "+1", " ", etc won't work.
[That form of 'comment' ought IMO to be banned as a public service.]
I also agree with C1ff about the lack of utility of "I like/don't like this" comments: "Cool choice of color palette", Or "Too expensive in comparators" takes trivially longer to type, but actually provides a meaningful opinion.
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WARNING: I have an extemely "grindy" playstyle; YMMV — if this doesn't seem fun to you, mine what you can from it & bin the rest.