1) Don't try to get across the park from an hour before a parade until half an hour after the parade.
2) Don't try to go ANYWHERE near Frontierland or NOS from an hour before first Fantasmic until an hour after last Fantasmic.
3) Don't try to go anywhere near Matterhorn, castle, hub or the north end of Main Street from an hour before fireworks until an hour after.
4) If you are at Small World and want to leave the park, 1 word...... TRAIN!
About 5 times a day, Disneyland stops being an amusement park and becomes a stock yard...