I-95 in Maryland and Delaware are toll roads. 95 continues up through Philadelphia, but pretty much dead ends at Trenton, NJ, wrapping around as 295, ending up heading south, unless taking 195 to the NJ Turnpike at Exit 7A. The Delaware Memorial Bridge is free northbound, and from there the choices are 295 north to 195 to the Turnpike, or just pay the turnpike toll from its southern terminus, as there really isn't a choice from Exit 7A north anyway.
The Tappan Zee (now named Mario Cuomo) is tolled also.
I-95 through Connecticut until east of New Haven is awful traffic pretty much all times of the day. That 60 miles has taken me as long as 3 hours on a Friday afternoon. 684 to 84 to the Mass Pike is better, or the scenic route up the Thruway to the Mass Pike extension better still from a traffic point of view.
On the return, yes, 88 and 86 are non-tolled interstates.
It really is impossible though to get around the northeast without paying highway and bridge tolls. Hence my suggestion of the EZ Pass tag. That will at least make it convenient and allow for passing through rolling and no cash out-of-pocket.