Cook pasta in salted boiling water according to package instructions, then drain and let it cool.
Chop the imitation crab meat into bite-sized pieces.
In a large bowl, mix pasta, crab, celery, and shredded carrots (if using).
In a separate bowl, whisk together mayonnaise, milk, sugar, salt, and pepper.
Pour the dressing over the pasta mixture and toss until everything is evenly coated.
Garnish with fresh dill, if desired.
Cover and refrigerate for at least 1 hour to let the flavors meld.
Serve chilled and enjoy!