The problem with a metronome is that it will give you timing, but not rhythm. It will also separate that timing from the music, rather than integrating it into it - you will be playing along to a timing, not playing with that timing.
Timing and rhythm are not the same thing, and what you need to develop is rhythm. Counting helps, but so does doing other activities, like walking, with a sense of rhythm - walk along like a waltz, or tap it out, or a march, or a funeral march, or whatever.