Yes and no. If you die without a will in Maryland, any assets that are not held jointly will be disbursed according to law:
"Children in Maryland Inheritance Law
If you have children who are minors, your spouse will inherit half of the intestate property and your children will inherit the other half. If you have no minor children, your spouse will inherit $15,000 of the intestate property and then half of the remaining property."
In my case, everything we own (houses, bank accounts etc.) is held in both our names with the exception of three cars. I negotiated the car deals and got the loans by myself so they ended up titled in my name alone. I learned my lesson after watching what happened with my fathers car so for the next car purchase, I made sure DH was on the title.
When my father passed, everything was in both his and Mom's names except the car and an acre of land in Florida. Mom had to open an estate and probate the will to have the car put in her name (so that she could renew the registration and eventually sell it). She forgot about he Florida property so I had to re-open his estate years later, have her estate inherit the land and then purchase the land from her estate.
I know a lot of couples who keep their finances separate. They should make sure that they have a pay on death beneficiary noted on their accounts or have a will.... unless they want the state to disperse as noted above.