Honestly, what you are exposed to depends on the hospital and the unit. The hospital I work in has 3 ICUs... CVICU, CCU and the SICU. I work in the SICU and our main patients are neuro, trauma, and critical surgical patients. We will occasionally get CCU type patients if they are full. We also will get transfers from CVICU if they have an infection. The CVICU at my hospital is a "clean" unit and they don't usually keep patients with anything transferable (flu, MRSA, C.diff, etc.)
We never have IABPs in my area and we rarely have swan lines. We do use a lot of drips for BP, HR, etc. We also have a lot of patients on CRRT, vents, and with monitors and drains such at Lycox, A-lines, CVP, Vigileo, ICP, ventric and lumbar drains.
The eating thing is something we joke about a lot. The SICU at my hospital rarely has people that can eat or use the call light. CCU generally has patients that are more active and can eat and use call lights. We also say that the patients in the SICU tend to be sicker and crash more often, but the CCU patients tend to crash a lot faster! Our SICU patients tend to have a lot more meds and our unit is generally busier than both the CVICU and the CCU.
If cardiac is something you are really looking into getting into, I would keep on looking, but if you are interested in giving neuro/trauma a try it could prove to be a huge learning experience for you! Would it be possible for you to shadow a nurse for a day to find out if you like the unit or not?