I got tired of manually dragging to select code or relying on triple-click line selection, so I built a VS Code extension that highlights the current syntactic block on hover. Once highlighted, press Alt+Enter to select it, then Alt+Up / Alt+Down to expand or shrink up and down the code blocksFeatures:
Hover to highlight the current code block
Alt+Enter to select, Alt+Up/Down to navigate the tree
Alt+Shift+H to toggle highlighting
Status bar shows the current AST node type
Configurable highlight color, status bar visibility, and enabled languages