Why would you need an immigrant visa to get married? As soon as you're married you're supposed to apply for a green card. Green cards through marriage are prioritized, not capped and all.
You would have to have already been on a different visa to have been here in the first place and like nraynaud said, it takes time.
Now, if you're talking about meeting your future spouse in the US, then yes. They would have needed a visa to be in the country in the 1st place.
My original comment was just wondering how a "immigrant marriage visa" would change anything.
Your driver's license will expire with your EAD card, the renewal of your EAD card can't be done more than 90day before expiration, but it takes more than 6 months to get a new one.
You can work 180 days with an expired EAD but not drive nor leave the country, and E-verify will be weird so you might lose your job anyways.