We've added numerous usability improvements to the Processing Graphical Modeler, including
The addition of helpful tooltips when hovering over model components
Algorithms and inputs connected to model components are highlighted as you hover the mouse over different parts of the model, making it much easier to visualise the model flow and connections inside complex models
Input parameter types are now shown in the title of the parameter definition dialog
The data type for numeric parameters may now be specified, allowing for integer-only inputs for models