Sometimes the result is Scala source files that almost appear to be written in different languages, or lots of little libraries each with their own wacky DSLs that require a major investment of time to comprehend just to accomplish something that should be trivial.
These sorts of abuses you really don't see in Clojure even though it's just as possible in that language. Of course this is all based just on my experience, YMMV.
But even Clojure is syntactically heavy compared to Racket or CL. But with good reason.
A powerful and expressive language takes effort, possibly even years, to become expert in. I'm not sure that making trivial things trivial is part of the plan. There are more appropriate languages for that.
Most of the cruft in Scala is due to its support of O-O and its attempt to modernize it. Similarly, C++ is a superset of C rather than a complete break from it (and often, in the field, you find people using it as if it were 'C with classes').
Also, the O-O side of Scheme is certainly more powerful than F#'s O-O side; however, overall F# is at least as powerful of a language (and yet it's also much cleaner/internally consistent).
[Also, it takes only one counter-example to disprove 'all those who say that Scala resembles C++ have never worked with either' (which was my original intent here)].