Default to using the enhanced man page interface:
set keywordprg=:Man
Use and to hop through man pages, as I’m too used to that setup in browsers:
augroup jnrowe_vim_man
autocmd!
autocmd FileType man
\ nnoremap <buffer> <CR>
\ :call man#get_page_from_cword('horizontal', v:count)<CR>|
\ nnoremap <buffer> <BS> <Cmd>call man#pop_page()<CR>
augroup END