Instead of a cluttered GUI, you can press Right Shift (or the designated control) to open a searchable menu where you can find any module by name.
Wurst is widely regarded as an excellent "introductory" client because of its intuitive navigation system. Download Wurst v6.26.1 MC1.12 OF
A unique addition that disables underwater gravity, allowing you to swim and stay submerged as if you were a mob. Instead of a cluttered GUI, you can press