Don’t pool it all together with this Java website - which sucks but not because it was from 2010.
I abhor and loathe modern web design.
I just remember the Java.com homepage from visiting it in computer lab in 2011 so I could play Minecraft.
The Java download button looks clickable without me having to hover over it. The Kotlin "get-started" link doesn't look clickable, because it's next to a different link that has a different style (both actually are clickable). The Scala one has a download link that also doesn't look clickable.
Rubbing salt into the wound, if you click on the second link for Kotlin ("learn more"), the back button doesn't work.
Summary
Java website: made as obvious as possible, prominent download and search interface on main page; type in your search and press enter.
Kotlin: Links differ in appearance from each other, back button broken for some links, which don't even look like links. Cannot type in a search term until after visually finding and clicking a search icon. Then you type in your search term (two-step process).
Scala: download link looks like neither a link nor a button. Never found a search button. At least "Back" works.
I have to say, the Java landing page works best. That your personal preference is for less obvious and less simple user interfaces doesn't make the simple and easy to use interface a bad choice.