buying first boat
By modern standards (last 20 years or so) 10,000 lbs is moderately heavy for a 35 footer. For example my 1983 38 footer has a design weight of 10,600 lbs. Weight really has very little to do with "pounding, bouncing, tender, sea sickness!" Those have more to do with weight distribution, hull shape, waterline beam and length of waterline. Because most of us experience light weight boats in the form of early light weight boats which were very dependent on form stability and generally had poor weight distribution, it is easy to come away with your impression of light weight boats.
The 382/383/384''s are nice all around boats. They do sail well with enough wind that are reasonably well built and offer a lot of boat for the money. As you say they are not a dog but to put their speed into perspective, at 7 knots of air, a more modern 38 foot design using a 110% jib will do over 7 knots upwind and will reach above a beam reach at close to 8 knots. In 12 knots of wind a more modern 38 footer (still using a 110% jib)will do close to 8 knots upwind and will reach above a beam reach at close to 9 knots and past a beam reach at closer to 8 knots.
Still we all go out there for our own reasons and if speed and light air performance is not important, the Morgan 382-384 are very nice boats.