Before I answer: Are you already presbyopic? That is, are your spectacles bifocals, and/or do you need readers at near while wearing contacts?
Re dry eyes after LASIK: The cutting of the LASIK flap severs a significant number of corneal nerves, which denervates the cornea. This dennervation interrupts the normal reflex arc that accounts for the lion’s share of tear production. Because of this, essentially everyone has dry-eye symptoms for weeks to (usually) a few months after LASIK. Once the corneal nerves regenerate, the symptoms lessen and eventually disappear. Most people can get through this period using artificial tears to compensate. However, if a pt had significant dry eyes prior to LASIK, their post-surgery symptoms will be worse, and will last longer–sometimes forever. (For this reason, many surgeons consider significant dry eyes a relative contraindication for LASIK.)
Re halos, starbursts, and other optical aberrations: These tend to become problematic when the pt needs a fairly high correction (at -5.25D, you are on the border between low and moderate myopia; high myopia is =>-12D), or if s/he has really large pupils. The reasons why are a bit inside baseball, but suffice to say the problem stems from light passing through the interface between treated and untreated cornea reaching the retina. Recent advances in corneal contouring have significantly reduced the occurrence and severity of halos. (Perchance, did your friends have it done a while ago?)