GWT is definitely heavy, considering all its functionality from minifying js, js splitting to optimize page load, multiple js output for browser specific optimization and to reduce js size, generating sprites, merging css, images, etc.
The best part of GWT is the testability aspect via MVP pattern if you compare it against weiting in pure JS which is usually hard to write headless test automation.
The best part of GWT is the testability aspect via MVP pattern if you compare it against weiting in pure JS which is usually hard to write headless test automation.