As a guest of a DVC Member, you will receive all the benefits of any guest staying at a resort at Walt Disney World, including Magical Express, the Dining Plan and Extended Magic Hours.  However, you will not receive any discounts at restaurants and shopping that a DVC member might receive (you would need to present your DVC card).
While DVC is a timeshare from Disney, nobody will bother you to take tours or pester you to sign up for anything (unless you approach them first).  One thing to keep in mind though is that with staying at a Vacation Club property, housekeeping is not done every day.  Trash is collected daily but the Towel service is included in all stays of more than four days. If your stay is for less than eight nights, you will receive new towels on day four. If your stay is for eight nights or longer, you will receive a full cleaning service with Towel service on day four and Towel service again on day eight.