Hi (author) - for me Silice brings comfort while designing, simplicity of reuse (groups+interfaces making it easy to assemble components), a syntax that is more to my taste (obviously ;) ) and ease of prototyping with the 'control-flow' FSM style and pipeline constructs. Plus the Lua pre-processor that I enjoy using. All this while staying close to Verilog and being able to inter-operate easily.

I also try to build an environment around Silice so that one can easily get started and enjoy testing things, experimenting with relatively advanced projects that are also (for several) explained in details. (The build system relies upon many great projects: yosys, nextpnr, edalize, openfpgaloader, verilator, icarus, etc.)

But this is a very subjective thing ; I absolutely understand that others may not like it or feel it is not necessary, being already expert at other tools. Also, I would never argue that one should use Silice instead of X. Take a look at the repo, checkout a few projects (I recommend 'vga_demo', 'terrain', 'ice-v', 'pipeline_sort' and, for pushing beyond reasonable, 'doomchip'). If you see something you might like, perhaps try making a simple design, see if that is a good tool for you.