I think that you've said it yourself, DD, They're not really unsightly
I can assure you that you'll never hear a word of complaint from either the baseboard or the laminate about dirt or drafts.
If you do have what you consider as too big a gap along a particular portion, and you don't want your marbles to roll into the gap, use a hi-grade CLEAR silicone; just cut the tip off to create a small orifice, fill the gap almost full and use your finger to create a slightly recessed cove just behind the front face of the baseboard.
For further reference; to get a tight inside corner joint, don't use a miter, use a cope. They are actually very easy to cut. Also, to ensure that the cope seats tightly, cut the section of whatever trim it is just a c-hair longer than the actual length needed so you are in essence, "wedging" that piece of trim into place.