"Right mouse button+Scroll wheel" will continue to zoom in/zoom out the Scene View instead of changing the camera speed on Unity 2019+

EditorCameraZoomWithScrollWheel.cs

#if UNITY_2019_1_OR_NEWER
using UnityEditor;
using UnityEngine;

[InitializeOnLoad]
public class EditorCameraZoomWithScrollWheel
{
	private const float CAMERA_SPEED = -0.25f;

	private static bool rmbDown = false;

	static EditorCameraZoomWithScrollWheel()
	{
		SceneView.beforeSceneGui -= OnScene;
		SceneView.beforeSceneGui += OnScene;
	}

	private static void OnScene( SceneView scene )
	{
		Event e = Event.current;
		if( e.isMouse && e.button == 1 )
		{
			if( e.type == EventType.MouseDown )
				rmbDown = true;
			else if( e.type == EventType.MouseUp )
				rmbDown = false;
		}

		if( e.isScrollWheel && rmbDown )
		{
			Vector3 pivot = scene.pivot;
			pivot += scene.camera.transform.forward * ( e.delta.y * CAMERA_SPEED );
			scene.pivot = pivot;

			e.Use();
		}
	}
}
#endif

How To

Simply create a folder called Editor inside your Project window and add this script inside it.

Sweet baby jesus, thank you for this!