It has actually improved a lot since then. The UI has had changes, search is better, it has quote posts now. More usability enhancements are under active development.
Ok it's not growing at the crazy rate that hit when news of the Musk twitter takeover broke. That's not a bad thing as the infrastructure couldn't sustain it, but it is growing.
I'm following @[email protected] and it reports a consistent steady growth in the number of user accounts. As of 48 mins ago ..
12,811,208 accounts
+594 in the last hour
+2,367 in the last day
+195,778 in the last week.
.. and it's quite typical to have just over 200k new accounts a week.
Then there was the news that on the 17th April 2023 the number of monthly posts across the Fediverse crossed one billion for the first time.
Personally my timelines are a hive of activity, far more than I can possibly keep up with.