Luckily the introduction of Motes of Harmony has made this a lot more likely...
I'm leveling a couple of characters on grinding profiles but they are all either mine/herb or skinners (on skinning grinds) so I always have a good story why I was running around in that area for a couple of hours. I always limit my time on those profiles as well; 3 or 4 hours at most. I'm not in a hurry
Do realize, though, that the XP per hour is abominable. On high-level you can get up to 2-2.5M per hour which isn't even half of what dungeons/quests would get you. So as said; be patient, don't rush, take it easy.
Grinding is still the most risky form of botting but if you don't push it, the chance of a ban isn't that high.